Perkʷū́nos (either "Striker" or “Oak God”) is the god of thunder and lightning. We’ve already seen him in his great myth, slaying the Serpent. As the mighty champion, he is a god of war, particularly against outside dangers and in defense of his people. As god of the thunderstorm, he is also a patron of farmers, and therefore connected with fertility, especially of crops. Other things connected with him, as will become clear, are gluttony, wheels, pillars, oaks, mountains, bulls, and goats. Above all, he is armed with a club, axe, and/or aerial weapon, which he throws.
Perkʷū́nos survived by name in Albania (Perëndi (“god,” “sky”) (Jakobson, 1972, 6)), Thrace (basically the area of modern Bulgaria) (Perkos), India (Vedic Parjanya and Kalasha Pērūne), and Anatolia (Pirwa (Gamkrelidze and Ivanov, 1995, 694) and Peruna (Jakobson; 1969; 588, 593)). There are also the Thracian hero Perkos and the Kush war god Pērūne (Jackson, 2002, 76, n. 25). The name might also underlie Greek Keraunós “thunderbolt,” which appears as a title of Zeus, if that is a tabu-variant of *Peraunós (Jakobson, 1972, 6). His worship under a name descended from *Perkʷū́nos survived best among the Balts and Slavs; among the Lithuanians, he was called Perkunas (variably, Perū́nas (Jakobson, 1972, 5), and in early texts, Percunus, Percunos, Pirchunos, Perkuns, Parcuns, or Pargnus (West, 2007, 239)), among the Latvians Perkons, among the Old Prussians Percuno(s) (Turville-Petre, 1964, 97), and among the Slavs Perún? (Old Russian Perunu, Belorussion Piarun, Slovak Parom). These Balto-Slavic reflexes were extremely popular; hundreds of places are named after him among the Balts alone (Gimbutas, 1973, 466). These include villages (Lithuanian, e.g., Perkūnai, Perkūniškiai, Slavic Perun), hills (e.g., Lithuanian Perkūnkalnis, Slavic Perushtitsa), and rivers (Lithuanian e.g., Perkūnija) (Gimbutas, 1973, 467).
In some of the descendant traditions his name comes from one of his titles, the Thunderer. Thus we have the Armenian Tork’ (Russell, 1990, 2680), Anatolian Tarrḫunda/Tarhunt (Russell, 1990, 2689; Matasovič, 2009), Norse Thor and Saxon Thunor (<*Thunaraz) and Celtic Taranis (variant Tanarus), all from *TorH2nt- (Matasoviç, 2009), from *(s)tenH2- “thunder” (Jackson, 2002, 77), giving a possible Proto-Indo-European alternate name of Torxṇts. The Hittite storm god Tar?unnaš (variants Tarhunna, Tarnunta, Tarawa), whose name has been assigned the meaning “vanquisher, smasher,” from *torh- “conquer, vanquish” (Anderson, 2008, 279; Jakobson, 1969, 588) or *terH2- “idem” (Jackson, 2002, 77) may belong to this group as well. Perun is sometimes called Gromovnik, “Thunder God” (Kropej, 2003, 121). Parjanya receives the title stanayitnú- “Thunderer.”
Reflexes with unrelated names include the Celtic deity known in Gaul, Ireland, and Wales as Lugos, Lug, and Lleu, respectively (etymology uncertain), the Greek/Roman Herakles/Hercules (“Glory of Hera” or possibly “Famed for Strength” (Mallory and Adams, 117, 1997)), and the Roman Mars (of unknown etymology). And of course there is the most famous Indo-European dragon-slayer of all, the Vedic Indra (possibly “one swollen with power“ (Mallory and Adams, 1997, 561)). The Irish god “the Dagda” (“The Good God”) also falls into this group; in Tochmarc Étaine he is said to control the weather (Sayers, 1982, 356). He further has by-names such as reo (“dense darkness; throw, cast”), oíbell (“spark of flame), and áith “sharp, keen” (Sayer, 1982, 345). Another, however, Cerrce, make come from *perkʷ- (Sayers, 1982, 345-6).
Other names by which Perkʷū́nos might be called in modern prayers today (they aren’t reconstructed for him) are *Koryonos, “god of the warband” (*koryos, in Mallory and Adams, 1997, 30-1) and Ḱówṛs *k´óuh1r-), “Powerful One, Hero” (Mallory and Adams, 1997, 560) .
The myth of Perkʷū́nos slaying a great serpent is the best-reconstructed Proto-Indo-European myth, surviving in many reflexes. Perkunas killed the dragon Áitvaras (West, 2007, 240), Indra killed a number of serpents/demons, the most famous being Vṛtra, a myth told many times (for instance RV 1.32; see O’Flaherty, 1975, 74-90 for examples). Herakles killed the multi-headed Hydra (Apollodorus, 2.5), the serpent of the Hesperides, and the serpents sent to kill him in the cradle. In the dindshenchas of Mag Muirthemne, the Dagda kills some kind of underwater monster with his “thunder-club” (lorg anfaidh; Gwynn, 1924, 4:295, translates it “mace of wrath,” but “thunder-club” is equally legitimate, and I think more likely). Thor is in constant opposition to the Midgard Serpent. Thor will kill and be killed by him in the final battle of Ragnarok (Snorri, “Gylfaginning” 51). He fishes the serpent up and brings him hammer down on his head, but the serpent either escapes on his own (“Hymiskviða” 21-24, Hollander, 1962). In an early version, related by the tenth century Úlf Uggason, Thor killed the serpent some time before Ragnarok (Turville-Petre, 1964, 76). The tale of their battle is also represented in stone reliefs (Stone, 1999, 17; Turville-Petre, 1964, 76). One of the panels of the Gundestrup cauldron, a silver-gilt work of art created in the Balkans or northeastern Italy but transported to and discovered in Gundestrup, Denmark, shows a deity holding a wheel, the symbol of the Gaulish Taranis. At the bottom of the panel is a ram-headed serpent. In eastern Gaul and western Germany we find the Jupiter columns, with their snake-spearing (or snake with men’s heads or upper bodies-spearing) Jupiters (note how in this last one the Jupiter figure has Taranis’ wheel on his shoulder) on top. Since the snakes sometimes have human heads, the columns may be meant to depict the fight with the semi-serpentine Typhoeus, but these columns are found only in this limited Celtic area, so they most likely represent something which was found in Celtic myth, represented in a classical form. Note that in these cases we are dealing with Jupiter the thunder and lightning god, not the reflex of Dyḗus Ptḗr. This myth may have survived into Christian times in the legend of St. George killing a dragon, represented in art in a form strikingly similar to that of the Jupiter columns.
In Albania, there is a monster called bolla, a term otherwise used for grass snakes (which are positive figures in both the Balkans and the Baltic regions), which on St. George’s Day (April 23) opens its eyes and eats whomever it sees. It was originally defeated by St. George (who hunts in the mountains (Elsie, 2001,100)), and cursed to be only able to open its eyes on this day (Elsie, 2001, 47). The dragon kulshedra, who guards the Earthly, Sea, and Heavenly Beauties, is a form of this dragon. She is defeated by St. Elias, who comes riding on his white horse or chariot of fire to kill her with thunderbolts (Elsie, 2001, 83). Her approach is accompanied by rain clouds. Churches dedicated to St. Elias are usually on hill tops (Elsie, 2001, 84).
Although not directly connected with the thundergod motif, it is in the form a snake that Ahriman attacks Ormazd, and in Iran snakes are the archetypal representatives of the evil reptiles (Zaehner, 155, 238).
The dragon-slayer is often accompanied by a human helper. Thus, Indra is helped in the killing of Trisiras by Trita Āptya (RV10.8). He returns the favor by helping Trita kill the serpent Visvarūpa (West, 2007, 260), cutting off the snake’s heads. Herakles is helped to kill the Hydra by Iolaos (Hesiod, Theogony, 313-18). The Ukrainian dragon-slaying god is helped by a smith, although he is also a god (West, 2007, 259). The wheel on the Gundestrup cauldron is held up by a smaller figure, almost certainly meant to be a human rather than a deity. The reverse is the case with Θraētaona, who kills the serpent Aži Dahāka with the help of the storm-god Vāyu (Mallory and Adams, 1997, 138).
The serpent often has multiple heads, usually three, or is multiple is some other way. The serpent of the Hesperides had a hundred heads (Apollodorus 2.5.11), the hydra had nine (Apollodorus 2.5.2, Hyginus 30), Trisiras has three, the kulshedra has seven to twelve (or nine tongues (West, 2007, 259)), Viśvarūpa three heads (RV 10.8.9; West, 2007, 260), and Aži Dahāka has three heads (Mallory and Adams, 1997, 138). There were two snakes killed by Herakles in his crib (Apollodorus 2.4.8, Hyginus 30). Geryon, a monster in mostly human form who was killed by Herakles, had three bodies (Apollodorus 2.5.10; Pausanias 5.19.1), joined at the waist, giving him three heads (Carpenter, 1991, fig. 201; Graves, 1965, 132) (or three bodies from the waist down, which would have meant he only had one head (Apollodorus, 2.5.10). (Geryon was the son of Chrysaor, who sprang from the neck of the decapitated Medusa, who had snakes for hair (Hesiod, Theogony, 280-93).) Thor is once called “cleaver of the nine heads of Þrívaldi” (Snorri, “Skáldskaparmál 4”; Lindow, 1988, 120).
The serpent is also connected with water in some way. The Midgard Serpent surrounds the earth in the waters. In “Skáldskaparmál” (Snorri, Epilogue 2) the Serpent is called “the water-soaked earth-band” against which Thor will “test his strength.” It is in the world-surrounding sea (Snorri, “Gylfaginning,” 34), and is called “Fiorgyn’s eel” (Snorri, Epilogue 57). We have seen how Thor fishes the serpent up from the sea. Geryon lives in “sea-girt Erythea” (Hesiod, Theogony, 290) and his mother was a daughter of Ocean (Apollodorus 2.5.10), the Hydra (“water”) lives in a swamp (Apollodorus 2.5.2), and the serpent of the Hesperides lives next to the ocean. The monster which the Dagda defeats is at the bottom of the sea. Vṛtra lays around (parisayānam) the waters, withholding them; Indra is “conquering in the waters” (Macdonell, 1897, 59). “Kulshedra” comes from the Greek kersúdros, “amphibious snake” (Elias, 2001, 153) and can turn herself into an eel, a turtle, a frog, or a salamander (Elias, 2001, 155), all water animals. She lives beneath a lake or a swamp, and rust-colored springs are believed to contain her blood; one way she kills people is by drowning them in her milk or urine (Elias, 2001, 155). She can cause wells to run dry, being appeased only by a human sacrifice (Elias, 2001, 155). In Albania, dead snakes were used in rain magic (Elias, 2001, 215). I think we are seeing here the connection between water and Chaos, of which the serpent is a representation.
Alternatively, the serpent might be guarding either women or cows (sometimes identified with each other). The Albanian kulshedra, guarding the three Beauties, is an example of this. Geryon guards cattle (Apollodorus 2.5.10; Hesiod, Theogony, 982-3; Carpenter, 1991, 126;. The waters withheld by Vṛtra are described as cattle in a stall (West, 2007, 259). Cutting off the heads of Viśvarūpa released cows (RV 10.8.9, 10.48.2). Θraētaona wins women (Mallory and Adams, 1997, 138). The many maidens guarded by dragons in folklore may be part of this motif.
Sometimes it is the hero who is triple. On one of the fifth-century gold horns from Gallehus, in Schleswig, we find a three headed man holding an axe. To his right is a goat, which he seems to hold on a leash. To his left are three snakes, one large one which seems to suckle the others (Davidson, 1988, 43, f. 2). A marble relief from Plovdiv in Thrace depicts a three-headed horseman with an axe, whom the family setting it up thanks for “health and safety” (Schiltz, 1987, 303).
As a hero god, Perkʷū́nos conquered many other opponents, both human and monstrous, beside the serpent(s). Thor fought giants, both male and female (Turville-Petre, 1964, 76), and dwarfs, and other, little-known monsters, including the expected wolves (Lindow, 1988). Herakles, in his labors, killed the Nemean lion and the Stymphalian birds, as well as fighting other dangerous animals. Lug kills Balor, who has a single eye that can kill by its gaze, and his Welsh equivalent Lleu kills, of all things, a wren (earning, thereby, the title “Of the Skillful Hand” (Ford, 1977, 101).
The Baltic hero was an ensurer of fertility. He was prayed to to send rain, as the Latvians did to Perkons (Gamkrelidze and Ivanov, 1995, 575) or, alternatively, to withhold damaging storms (West, 2007, 239; Gimbutas, 1973, 474). The Balts and Slavs believed that the first thunder of spring would “unlock the earth” (West, 2007, 259), causing plants to grow again; lightning achieves the same result (Gimbutas, 1973, 471; 1971, 165).
Thor and Lug also have fertility connections. In Þrymskviða, Thor’s hammer is used to bless a bride (actually Thor himself in disguise), perhaps intended to give her fertility; the hammer has been interpreted in this case as phallic (Turville-Petre, 1964, 81). In both Denmark and Sweden there are wheatfields dedicated to him (Thórsakr) (Turville-Petre, 1964, 93-4), and in England there are Thunderfeld and Thunresfeld (Turville-Petre, 1962, 20). Lug learns from Bres the secrets of when to plough, when to sow, and when to harvest.
Mars’ role as a protector of agriculture (Pinsent, 1986, 182; Scullard, 1981, 83) is relevant here as well. There is also the story of the conception of Romulus and Remus, or rather the conceptions, since one just says that they were the sons of Mars, and the other tells of a phallus appearing on the hearth of the king of the Albans, with which he the king commanded his daughter to have intercourse. (She actually made her maid do it.) (Plutarch, “Life of Romulus,” 2.3-4, Lives). We are not told that the two stories are connected, but we have to consider at least the possibility that the phallus is meant to be that of Mars. There are images of Mars in a fertility role in the Cotswolds (Green, 1986, 136); this would likely be a British god identified with him, but those doing the identifying must have seen Mars as himself associated with fertility.
Parjanya is sometimes the consort of Earth (AV 12.1.12, Whitney, 1905, 663; Macdonell, 1999, 104; 1897, 84), and it is his rain that is the semen that fertilizes her. (“Nature is born for the whole world when Parjanya quickens the earth with his seed” (RV 5.83.4; Macdonell, 1999). In the rest of this hymn, dedicated to Parjanya, he is described as “bellowing,” just as Indra is, and as accompanied by the Maruts, who are thunderstorm spirits that more commonly accompany Indra. (It must be noted, however, that Dyaus also fertilizes the earth (RV 1.100.3, 5.17.3, in West, 2007, 181).) Indra has become the thunder god in the Veda, but besides his name and his rain, Parjanya is the “father of the mighty bird” (RV 9.82.3, in Hillebrandt, 1980 (1929), 227) which brought the soma, the sacred drink of which Indra is so fond. It is both amusing and highly appropriate that in the agnihotra ritual Parjanya is offered to next to the water-barrel (Gonda, 1980, 417), which would have been filled by rain.
There is some question, however, as to whether the name of “Parjanya” belongs to this list. According to West (2007, 245), the expected outcome in Vedic Sanskrit should be “**Parkyn(y)a. Some have suggested a combination of another “strike” root, *per-ǵ, and then perhaps taboo deformation to fix things. The name “Perkunas” was avoided by those in the Baltic lands (Gimbutas, 1973, 469-700), and there is the possible Greek Keraunos mentioned earlier to provide precedent. I am not competent to judge on the linguistics, but I find it difficult to believe that a name so close for a deity so close is not related somehow.
Herakles is not generally considered a thunder-god. However, as we have seen he is a serpent-killer and he is armed with both a club and fiery arrows. On the continent, he was sometimes identified with Donar (“thunder”), with whom Jupiter was also sometimes identified (Davidson, 1988, 207). According to Macrobius (3.12.2), there was a description of the rites of his Roman counterpart Hercules in a book by Varro named On Thunder. It is unfortunate that we don’t know much about this book, but the connection between Hercules and thunder is suggestive.
Mars is also not often thought of as a god of thunder and lightning, that role being taken by Jupiter. I believe he should be seen this way, however (as does York, 1988, 160). First, Jupiter likely acquired his thunderbolt from Zeus, who in turn acquired it from the Near Eastern chief gods who are thunder gods. The names of both deities – “Shining (sky)” – show that originally they couldn’t originally have been gods of the stormy, and therefore cloudy, sky. He is connected with oaks (York, 1988, 160). Mars is a not only god of war, but is also associated with agriculture; this connection which has puzzled generations of classicists can easily be explained if he was in origin a thunder god. According to Macrobius (3.12.5-8), Mars was identified with Hercules, whom we have already seen is a thunder and lightning god. Most important, the Romans possessed an ancient shield which they believed to have been thrown down from the sky (York, 1988, 74). There was a stone kept near the temple of Mars in Rome which was carried in a procession to outside the city as a rain-making ritual (Scullard, 1981, 15). Finally, Mars was connected with the oak (York, 1988, 161).
The hero Beowulf may be an epic reflex of this deity. At the end of his tale he, like Thor kills and is killed by a dragon, and earlier he dives beneath the sea in his greatest deed of slaying Grendel and Grendel’s mother. Both these monsters come from beneath the sea to attack the well-ordered hall of Hrothgar, which, as Michael Enright (1996, 5) puts it, “symbolize[s] the realm of warmth, protection and honor standing true against the wintery waste and chaos of the stormy world outside.” Chaos threatens Cosmos, and the representatives of Chaos must be destroyed by the hero.
Perhaps the most famous reflex, however, is Indra, the Vedic champion god. His major deed is killing the great serpent Vṛtra, after being fortified with the sacred drink soma. He is so identified with this myth that he is often called simply Vṛtrahan, “killer of Vṛtra.” In Iran he survived under both names, as a demon Indara, and a god, Vərəθraγna. This is even though his dragon-slaying myth does not survive there, and there is no demon with the name Vərəθra, which would have been the Iranian version of Vṛtra (Duschesne-Guillemin, 1969, 332-3).
Indra was armed with some sort of throwing club (it may also be used to strike), called the vájra. It is likely of copper, since it is described as “red-brown,” the Vedic term for copper (Mallory and Adams, 1997, 112), but is also sometimes called aśman “stone” or parvata “rock” (Macdonell, 1897, 55).
Herakles, the Dagda, and Perúnъ (Polomé, 1983, 547) were all armed with clubs, with Herakles also bearing a bow; Apollodorus (2.4.9) also provides him with a javelin. The three-headed figures from the Gallehus horn and Thrace both carry an axe. Perkunas can be armed with a mace, a spear, a sword, an iron rod, arrows, or stone bullets (West. 2007, 240), and Perún with an axe (Kropej, 2003, 126; West, 2007, 242), arrow (West, 2007, 242), or hammer (Kropej, 2003, 126). The strely “arrow” of Perkunas is, despite its name, a Neolithic axe or a piece of a meteor (Gimbutas, 1973, 475). Stone tools, i.e., Neolithic axes and such, believed to be thunderbolts (Maher, 1973, 446) were used as talismans to protect homes from lightning (Gimbutas, 1973, 476) and to protect soldiers and hunters (Maher, 1973, 446).
The Dagda has his “thunder club.” When Lug asks him what power he can put against the Fomorians, he says that the dead under his club will be as many as “hailstones under the feet of horses” (“Cath Maige Tuired,” Gray, 1982, 119). He also had an axe; when a woman said that she would block every ford before him with an oak tree, he said he would go past and leave a mark from his axe on them (“Cath Maige Tuired,” Gray, 1982, 93). The weapon of the Hittite Weather God was a mace (Güterbock, 1950, 89). Thor’s famous hammer was named Mjøllnir, which is cognate with Russian molnija, Old Prussian mealde, and Welsh melt all of which mean “lightning” (Maher, 1973, 450). We’ve seen the axe of the three-headed figure on the Gallahus horn. Thor’s hammer may have been a later replacement for an axe (Davidson, 1969, 614), which is found in Landnámabók (Sturlubók, ch. 257, in DuBois, 1999, 161; Turville-Petre, 1964, 84). His weapon is also described as a club (Saxo Grammaticus, Historia Danica III, 73, in DuBois, 1999, 159).
The enemies of the kulshedra, the drangues, (or dragua (Elsie, 2001, 83)) fight with her with meteors or lightning (West, 2007, 259), or with a plough (Elsie, 2001, 208).
Both Lug (Gray, 1982, 61) and Lleu kill with rocks; Lug uses a sling, and Lleu goes barehand. (Kim McCone (in Radner, 1991, 143) holds that the battle between Lug and Balor, including, I would presume, the use of a sling, was influenced by that of David and Goliath. However, the parallel with Lleu, a story which is less similar to the biblical one, suggests that this is not the case.) Lug also has a spear that no foe has ever withstood (“Cath Maige Tuired”, Gray, 1982, 25). In some folklore variants, Lug’s weapon is a red-hot iron staff from a smithy (Radner, 1991, 142), but that can be seen as a variant of a spear, perhaps of lightning because of its heat, and that it is taken from a smith, the user of fire, iron, and a great hammer. Lleu later uses a specially made spear against an enemy (Ford, 1977, 108-9), but it’s against his wife’s lover.
Although a club was Herakles’ defining weapon (he is almost never shown without it), he more often fights with arrows. This is how he killed Geryon (Apollodorus 2.5.10) (although in a 7th century BCE bronze relief, as well as one from the 6the century BCE, he uses a sword (Carpenter, 1991, fig. 201, 202)) and the serpent of the Hesperides (Apollonius of Rhodes, Argonautica, 4.1422 ff.; Graves, II, 146). He killed the Hydra with both flaming arrows and his club (the arrows forced it out of its lair, and he used the club to crush its heads), with the help of Iolaus burning the heads as he crushed them (Apollodorus, 2.5.2) (or as he cut them off). As well as his vájra, Indra also used arrows.
The weapons of the reflexes vary, then, but they can be categorized as either clubs (Perkunas, Indra, Herakles, the Dagda, Thor, the Hittite Weather God) or aerial weapons (mainly thrown axes and hammers (Perkunas, Perún?, Thor) but also arrows (Herakles, Perún, Perkunas, Indra; Indra’s vájra, although a club, is also thrown)).
The most primitive of these weapons would be a club or axe; I believe that Perkʷū́nos’ classic weapon is the double-headed axe, either metal (bronze or copper; the Proto-Indo-Europeans may have used iron in a very late period) or flint. The Proto-Indo-European word for his weapon would be *wágros, “smasher” (Watkins, 1995, 411; West, 2007, 460), from which Indra’s weapon, the vájra, draws its name. Perkʷū́nos throws his wágros, and it returns to him to be thrown again. It does not take much imagination to see in a club or an aerial weapon an image of lightning.
An attribute which does not seem to be a weapon is the wheel (although the deity on the Gundestrup cauldron may be using it as such; perhaps it has been broken in the battle). This is commonly found in British and Gaulish representations which appear to combine Jupiter and a Celtic god, presumably Taranis. There are inscriptions which identify the two, such as one from Chester, to Jupiter Optimus Maximus Tanarus (Green, 1986, 130). There are also images which combine the two, with a wheel in one hand and a thunderbolt in the other (e.g., MacCana, 1970, 35).
One intriguing image is on a pottery stamp from Corbridge (Ross, 1967, pl. 65a), which shows a helmeted god carrying a shield and leaning on a crooked club. A wheel is on the ground to his right (since this is a mold, in the formed version it would have been on his left). The helmet and shield may link him with Mars, who is a protector and agricultural god, and the club with the snake-killer Hercules. That the club is crooked may be an attempt to portray a lightning flash. We would therefore have a Taranis-Mars-Hercules, and a god who is a protector, agricultural, a slayer of serpents, and connected with lightning, accompanied by a wheel.
We have already seen how the wheel can be a sun symbol, and there are those, such as Miranda Green (see, for example, her 1986, 130-1), who identify the wheel found with the thunder god (and, indeed, all wheels) that way, and believe that its connection with the thunder god is as a celestial symbol. It must be remembered, however, that a symbol can have more than one meaning. I don’t see, however, why a sun would be an appropriate symbol for a god of the cloudy sky. More likely is that the wheel is a representation of thunder, which even today we describe as “rolling.” This seems to have been the Germanic concept as well; thunder in both Old English and Icelandic is referred to as “travelling or moving” (Turville-Petre), and thunder-gods often move in chariots.
There is a possible connection between columns and thunder gods. In Gaul (particularly eastern France and western Germany) and Britain we find the Jupiter columns. “Thurstable,” the name of a place in England, had the original meaning of “Thor’s Pillar” (Turville-Petre, G., 1962, 21; Turville-Petre, E. O. G., 1964, 99). Thor was the god of house pillars (Turville-Petre, 1964, 88). In India, there are poles used at certain festivals that are identified with Indra (Gonda 1980, 427; Kuiper, 1975, 111). Indra was also connected with the sacrificial pillar, the yūpa (Woodard, 2006, 95). The close connection between Odin and Yggdrasill (he hangs on it to gain the runes, his horse is tied to it) may be relevant; although Odin is not a thunder god, he is the chief one. In fact, perhaps it is being chief god, rather than being the thunder god, that makes the connection; the god of the pillar is the god of the axis mundi. Might “the pillars of Hercules” be connected here? There is certainly a myth explaining them, but the use of the word “pillar” to describe them is suggestive; other words could have been used.
In European folklore, Neolithic axes, often turned up by farmers when plowing, were believed to be actual thunderbolts. Proto-Indo-European *H2ekmon applies to a constellation of ideas including the sky, thunder, and stone axes (Maher, 1979, 161). This connects with a belief held of Perkunas that the first thunderstorms of spring fertilized the fields (Gimbutas, 1973, 471).
Perún was a god of truth, specifically of oaths. He was invoked in treaties; in one case it was said that oath-breakers, who had thereby become accursed by him, would be slain by their own weapons (Jakobson, 1969, 582; Turville-Petre, 1964, 96). Thor was also a god who enforced law (Davidson, 1969, 613). The enforcement of law by Perkʷū́nos is a natural outgrowth of his role of slaying forces of disorder.
Perkunas is described by Simon Grunau in the Prussian Chronicle (dating from c. 1520), (West, 2007, 240), as “an angry-looking middle-aged man with a fiery face and a dark crinkly beard. He spits fire, and hurls an axe or (less often) a hammer, which returns to his hand.” Perún has a tawny (West, 2007, 242) or copper (Gimbutas, 1971, 165) beard. Indra also has a tawny beard (RV 10.23.4, in Macdonell, 1897, 55) as well as tawny hair (10.96.5, 8 in Macdonell, 1897, 55). Herakles flashes fire from his eyes (Apollodorus 2.4.9).
Indra’s arms are long and far-extended (Macdonell, 1897, 55), lining up nicely with “Lug of the Long Arm” (Rees & Rees, 1961, 52). The epithets likely refer to the two deities’ throwing ability.
The sacred animal of Perkʷū́nos is the bull, an animal of great power, rampant sexuality, and danger (For Perkunas, Gimbutas, 1973, 470.) Only Mars was offered a bull specified as fertile (Puhvel, 1978b, 360). The Umbrians sacrificed bull-calves to Mars Hodius (“The Bronze Tablets of Iguvium” I b 3; in Poultney, 1959, 162; Weiss, 2010, 248) and three bulls to Mars Grabovius (VI b 1, Weiss, 2010, 248, n. 7). Poultney (1959), 251, had previously translated this as “three oxen.”) Cato (On Agriculture, 83) relates a ritual for the health of cattle directed towards Mars Silvanus. Bulls are also not the only animals sacrificed to Mars in Rome; in Cato’s famous suovotaurilia prayer (On Agriculture, 141), he is offered a calf, a lamb, and a pig (probably a piglet).) Procopius (De Bellico Gothico 3.14) tells us that bulls were sacrificed to the Slavic thunder god, and, indeed, bulls were sacrificed to St. Elias, his Christian replacement, into modern times (Polomé, 983, 546) (although Elsie, 2001, 84, says oxen). In Armenia, a black bull was associated with the thunder god (Petrosyan 2011, 346). Black bulls were also offered to the Lithuanian and Hittite thunder gods (Petrosyan, 2011, 347). A plaque from Thrace with a horseman similar to the three-headed one depicts a bull sacrifice (Schiltz, 1987, 298). Indra eats many buffaloes (Macdonell, 1897, 56), and may take the form of a red bull (Hillebrandt, 1980 (1929), 132). In sacrifices to him, the dakṣiṇā (the gift to the priest) was a bull (Hillebrandt, 1980 (1929), 132). In the triple sacrifice, the sautrāmaṇi, of a ram, a bull, and a buck, the bull is sacrificed to him (Mallory and Adams, 1997, 138). Parjanya is sometimes called a bull, who fertilizes the earth (RV 5.83.1; Macdonell, 1897, 83). The hoof beats of a running bull suggest thunder. One of the Proto-Indo-European words for "bull," *wisontos, means "the one who urinates." The combination of bellowing and urination brings to mind the god of thunderstorms.
Some of his reflexes are connected with goats. The car of Perkunas is drawn by one or more (West, 2007, 240; Gimbutas, 1980, 165; Gimbutas, 1973, 466). A 16th century sacrifice to Percuno(s) included a goat (Turville-Petre, 1964, 97). The infant Zeus, who has acquired the thunder and lightning power of Perkʷū́nos is fed with goat’s milk. Zeus sits on a goat skin when he produces rain (Gimbutas, 1973, 471). The Gallehus figure has a goat on a leash. An image of Thor described in the late 12th or early 13th century is seated in a chariot drawn by goats, which is how is described in the Haustlong as well (Turville-Petre, 1964, 81-2). He is even called “lord of goats” (Turville-Petre, 1964, 82). There was a Roman festival of Jupiter at the Caprae Palus, “Marsh of the She-Goat” (Evans, 1974, 103). The Ossetes set up a pole with a black goat’s skin on it by the grave of someone who had been struck by lightning (Evans, 1974, 103, n. 2).
Bulls and goats are, of course, animals connected strongly with male sexuality and fertility.
It is probable that rituals in honor of Perkʷū́nos involved dancing. In Rome the Salii priest danced in honor of Mars through the city each March 1st (Mars’ birthday (Kershaw, 2000, 122)), 9th, 19th, and 23rd in armor; one of their shields was that which had been cast down from the sky, and the others were duplicates (Scullard, 1981, 85-6, 93). (Hercules also had Salii (Macrobius 3.12.5-8); Macrobius says this is because Mars and Hercules were the same god.) The crying of the infant Zeus was drowned out by the Kouretes, dancing with spears and shields (Apollodorus, 1.1.7); Hesiod (Fragment 6, in Hesiod, 1937, 277) calls them “sportive dancers.” Perkons himself is said to have danced (Ogibenin, 1974, 33, n. 11), as is Zeus (“The Epic Cycle” 5, in Hesiod, 1936, 481). Indra and the Maruts were called nṛtu, “dancers” (Dumézil 1970a, 211).
The Thunder God is a glutton. Thor in the land of giants downs three barrels of mead and the Dagda eats a cauldron full of eighty gallons of milk, eighty gallons of oats, eighty gallons of fat, goats, sheep, and pigs (“Cath Maige Tuired,” Gray, 1982, 89-92).
Indra can eat up to three hundred buffaloes (Keith, 1989, 124-5) and drinks more soma than he should.
There is an ancient connection between Perkʷū́nos and Dyḗus Ptḗr (Gamkrelidze and Ivanov, 1995, 694), (possibly pre-dating the rise of the social division seen in the ideology of the three functions), as gods of the stormy and of the sunny sky, respectively. This is well expressed in the comparison between their usual sacrificial victims, the unpredictable, passionate bull (the stormy sky), and the placid, rulable ox (the clear sky).
There is an interesting parallel between two myths told of Thor and of Indra. Loki has stolen Thor’s hammer and given it to the giants. To get it back, the two travel to the land of the giants, with Thor dressed as a woman. A comic tale follows, with Thor supposedly there to marry one of the giants. Indra, on the other hand, falls in love with an Asura. He goes to live among them, in the form of a woman among the women, and a man among the men (Macdonell, 1897, 57). The combination of taking a female form among Outsiders is interesting and suggestive, but we can’t go any further.
It is possible that being on horseback was a characteristic of Perkʷū́nos. As well as the Jupiter columns, there is an altar dedicated to Perún? (found at Peryn’, near Novgorod, where he is on horseback, and the Hittite Pirwa also rode a horse (Gamkrelidze and Ivanov, 1995, 474). The Roman horse sacrifice was dedicated to Mars, and the Vedic one originally to Indra. However, this remains only a possibility.
There is some question as to whether his name should be translated as “Striker” or “Oak God.” The *perkʷ- in his name may be that which is the root of “percussion,” or the source of words meaning "oak," perhaps because oaks were believed to be often struck by lightning (Gimbutas, 1973, 467; Polomé, 1983, 546). (This has, in fact, been shown to be the case in reality (Hillebrandt, 1980 (1929), 398-9)). The root has reflexes meaning “strike” in Lithuanian (perti), Slavic (prati), and Armenian (harkanem) (Gimbutas, 1973, 466, n. 1). In Latin (quercus) and Celtic (hercos), on the other hand, the meaning is “oak” and “oak forest,” respectively. Other descendants are linked with "mountain" (Gamkrelidze and Ivanov, 1995, 526-527), such as Hittite peruna and Sanskrit párvata, both meaning “mountain top” (Gimbutas, 1973, 466); this is also the case in the Gothic fairguni (Jakobson, 1972, 6). Maximus of Tyre provides the additional information that the Celts venerated oaks as a symbol of Zeus (Davidson, 1988, 23; Ross, 1967, 33). There was an oak grove dedicated to Thor at Dublin.
This complex of ideas – striking, lightning, oak, and mountain – identifies Perkʷū́nos with the axis mundi. This fits with his position as defender of truth; he is the support of the universe. The oak connection also emphasizes his strength, integrity, and tenacity. The root *dreu-, from which comes English "tree" and "true," formed the root for "oak" in some languages. Perkʷū́nos is hard, even stubborn. But stubbornness in defense of truth is a virtue.
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