elemental deities: the 'Daylight-Sky' (*Dyḗus), his partner 'Earth' (*Dʰéǵʰōm), his daughter the 'Dawn' (*H₂éwsōs), and his Twin Sons, the 'Sun' (*Séh₂ul) and the Sun-Maiden, and deities of winds, waters, fire, rivers and springs. The Proto-Indo-European creation myth tells of a primordial sacrifice performed by the first man *Manu ("Man") on his twin brother *Yemo ("Twin"), from whom emerged the cosmological elements. Other deities, such as the weather-god *Perkʷunos and the guardian of roads and herds, *Péh₂usōn, are probably late innovations since they are attested in a restricted number of traditions, Western (European) and Graeco-Aryan, respectively. Rituals Proto-Indo-Europeans practiced a polytheistic religion centered on sacrificial rites of cattle and horses, probably administered by a class of priests or shamans. Animals were slaughtered () and dedicated to the gods () in the hope of winning their favor. The king as the high priest would have been the central figure in establishing good relations with the other world. The Khvalynsk culture, associated with early Proto-Indo-European, had already shown archeological evidence for the sacrifice of domesticated animals. Proto-Indo-Europeans also had a sacred tradition of horse sacrifice for the renewal of kinship involving the ritual mating of a queen or king with a horse, which was then sacrificed and cut up for distribution to the other participants in the ritual. Although we know little about the role of magic in Proto-Indo-European society, there is no doubt that it existed as a social phenomenon, as several branches attest the use of similarly worded charms and curses, such as ones against worms. Furthermore, incantations and spells were frequently regarded as one of the three categories of medicine, along with the use of surgical instruments and herbs or drugs. Since the earliest evidence for the burning of the plant was found in Romanian kurgans dated 3,500 BCE, some scholars suggest that cannabis was first used as a psychoactive drug by Proto-Indo-Europeans during ritual ceremonies, a custom they eventually spread throughout western Eurasia during their migrations. Descendant cognates of the root *kanna- ("cannabis") have been proposed in Sanskrit śaná, Greek kánnabis (κάνναβις), Germanic *hanipa (German Hanf, English hemp), Russian konopljá, Albanian kanëp, Armenian kanap and Old Prussian knapios. Other linguists suggest that the common linguistic inheritance does not date back to the Indo-European period and contend that the word cannabis likely spread later across Eurasia as a Wanderwort ('wandering word'), ultimately borrowed into Ancient Greek and Sanskrit from a