Some deities, like the weather god *Perkʷunos or the herding-god *Péh₂usōn,[note 2] are only attested in a limited number of traditions—Western (i.e. European) and Graeco-Aryan, respectively—and could therefore represent late additions that did not spread throughout the various Indo-European dialects.
Some myths are also securely dated to Proto-Indo-European times, since they feature both linguistic and thematic evidence of an inherited motif: a story portraying a mythical figure associated with thunder and slaying a multi-headed serpent to release torrents of water that had previously been pent up; a creation myth involving two brothers, one of whom sacrifices the other in order to create the world; and probably the belief that the Otherworld was guarded by a watchdog and could only be reached by crossing a river.
[13][14][15] Dumézil's theory had a major influence on Indo-European studies from the mid-20th century onwards, and some scholars continue to operate under its framework,[16][17] although it has also been criticized as aprioristic and too inclusive, and thus impossible to be proved or disproved.
[19] This approach tends to focus on cultural universals within the realm of mythology rather than the genetic origins of those myths,[18] such as the fundamental and binary opposition rooted in the nature of marriage proposed by Tamaz V. Gamkrelidze and Vyacheslav Ivanov.
[22] Baltic mythology has also received a great deal of scholarly attention, as it is linguistically the most conservative and archaic of all surviving branches, but has so far remained frustrating to researchers because the sources are so comparatively late.
[38] Bruce Lincoln's reconstruction of the Proto-Indo-European motif known as "Twin and Man" is supported by a number of scholars such as Jaan Puhvel, J. P. Mallory, Douglas Q. Adams, David W. Anthony, and, in part, Martin L.
[39] Although some thematic parallels can be made with traditions of the Ancient Near East, and even Polynesian or South American legends, Lincoln argues that the linguistic correspondences found in descendant cognates of *Manu and *Yemo make it very likely that the myth has a Proto-Indo-European origin.
To create the world, Manu sacrifices his brother and, with the help of heavenly deities (the Sky-Father, the Storm-God and the Divine Twins),[43][47] forges both the natural elements and human beings from his remains.
[52][53] The myth has been interpreted either as a cosmic conflict between the heavenly hero and the earthly serpent, or as an Indo-European victory over non-Indo-European people, the monster symbolizing the aboriginal thief or usurper.
*Jumijaz), ancestor of the giants (jötnar); and, most likely, Remus (from Proto-Latin *Yemos or *Yemonos, with the initial y- shifting to r- under the influence of Rōmulus), killed in the Roman foundation myth by his twin brother Romulus.
[44] The traditions of sacrificing an animal to disperse its parts according to socially established patterns, a custom found in Ancient Rome and India, has been interpreted as an attempt to restore the balance of the cosmos ruled by the original sacrifice.
Descendant cognates include Hittite āra ('right, proper');[67] Sanskrit ṛta ('divine/cosmic law, force of truth, or order');[68][69] Avestan arəta- ('order'); Greek artús ('arrangement'), possibly arete ('excellence') via the root *h₂erh₁ ('please, satisfy');[70] Latin artus ('joint'); Tocharian A ārtt- ('to praise, be pleased with'); Armenian ard ('ornament, shape'); Middle High German art ('innate feature, nature, fashion').
[74] According to Martin L. West, the root *dʰeh₁- also denotes a divine or cosmic creation, as attested by the Hittite expression nēbis dēgan dāir ("established heaven (and) earth"), the Young Avestan formula kə huvāpå raocåscā dāt təmåscā?
[86] The story begins when an archdemon, usually coming from a different and inimical paternal line, assumes the position of authority among the community of the gods or heroes (Norse Loki, Roman Tarquin, Irish Bres).
[87] A new leader (Norse Víðarr, Roman Lucius Brutus, Irish Lug), known as the "silent one" and usually the nephew or grandson (*népōt) of the exiled archdemon, then springs up, and the two forces come together to annihilate each other in a cataclysmic battle.
[89][88] In the cosmological model proposed by Jean Haudry, the Proto-Indo-European sky is composed of three "heavens" (diurnal, nocturnal and liminal) rotating around an axis mundi, each having its own deities, social associations and colors (white, dark and red, respectively).
The common motif is suggested by the legends of the Indic Śvetadvīpam ("White Island"), whose inhabitants shine white like the Moon and need no food; the Greek Hyperborea ("Beyond the North Wind"), where the Sun shines all the time and the men know "neither disease nor bitter old age"; the Irish Tír na nÓg ("Land of the Young"), a mythical region located in the western sea where "happiness lasts forever and there is no satiety";[92] or the Germanic Ódáinsakr ("Glittering Plains"), a land situated beyond the Ocean where "no one is permitted to die".
[95] Most of the goddesses attested in later Indo-European mythologies come from pre-Indo-European deities eventually assimilated into the various pantheons following the migrations, like the Greek Athena, the Roman Juno, the Irish Medb, or the Iranian Anahita.
[122] The ritual expressions Debess tēvs in Latvian and attas Isanus in Hittite are not exact descendants of the formula *Dyḗws Ph₂tḗr, but they do preserve its original structure.
[145] In the three-sky cosmological model, the celestial phenomena linking the nightly and daily skies is embodied by a "Binder-god": the Greek Kronos, a transitional deity between Ouranos and Zeus in Hesiod's Theogony, the Indic Savitṛ, associated with the rising and setting of the sun in the Vedas, and the Roman Saturnus, whose feast marked the period immediately preceding the winter solstice.
[177][178] From another root *(s)tenh₂ ("thunder") stems a group of cognates found in the Germanic, Celtic and Roman thunder-gods Thor, Taranis, (Jupiter) Tonans and (Zeus) Keraunos.
The Slavonic water nymphs víly are also depicted as alluring maidens with long golden or green hair who like young men and can do harm if they feel offended.
Mallory and Adams however note that while the lexical correspondence is probable, "there is really no evidence for a specific river goddess" in Proto-Indo-European mythology "other than the deification of the concept of 'river' in Indic tradition".
[206] Based on these different traditions, Yaroslav Vassilkov postulated a proto-Indo-European wind deity which "was probably marked by ambivalence, and combined in itself both positive and negative characteristics".
[203] Although the name of the divinities are not cognates, a horse goddess portrayed as bearing twins and in connection with fertility and marriage has been proposed based on the Gaulish Epona, Irish Macha and Welsh Rhiannon, with other thematic echos in the Greek and Indic traditions.
They often appear in mythical narratives alongside the goddesses Papaya and Istustaya, who, in a ritual text for the foundation of a new temple, are described sitting holding mirrors and spindles, spinning the king's thread of life.
[234] The three spinning fate goddesses appear in Slavic traditions in the forms of the Russian Rožanicy, the Czech and Slovak Sudičky, the Bulgarian Narenčnice or Urisnice, the Polish Rodzanice, the Croatian Rodjenice, the Serbian Sudjenice, and the Slovene Rojenice.
[294] In both accounts, an authority figure forces the evil entity into submission by inserting his hand into the being's orifice (in Fenrir's case the mouth, in Ahriman's the anus) and losing or impairing it.
[296] Although the concept of elevation through intoxicating drink is a nearly universal motif, a Proto-Indo-European myth of the "cycle of the mead", originally proposed by Georges Dumézil and further developed by Jarich G. Oosten (1985), is based on the comparison of Indic and Norse mythologies.
The Indic Arjuna is also instructed to throw his bow Gandiva into the sea at the end of his career, and weapons were frequently thrown into lakes, rivers or bogs as a form of prestige offering in Bronze and Iron Age Europe.