Deities

Gromoviti znaci or thunder marks such as these were often engraved upon roof beams of houses to protect them from lightning bolts. Identical symbols were discovered on Proto-Slavic pottery of 4th century Chernyakhov culture. They are thought to be symbols of the Slavic god of thunder, Perun.

Ivanov and Toporov reconstructed the ancient myth involving the two major gods of the Proto-Slavic pantheon, Perun and Veles. The two of them stand in opposition in almost every way. Perun is a heavenly god of thunder and lightning, fiery and dry, who rules the living world from his citadel high above, located on the top of the highest branch of the World Tree. Veles is a chthonic god associated with waters, earthly and wet, lord of the underworld, who rules the realm of the dead from down in the roots of the World Tree. Perun is a giver of rain to farmers, god of war and weapons, invoked by fighters. Veles is a god of cattle, protector of shepherds, associated with magic and commerce.

A cosmic battle fought between the two of them echoes the ancient Indo-European myth of a fight between a storm god and a dragon. Attacking with his lightning bolts from the sky, Perun pursues his serpentine enemy Veles, who slithers down over the earth. Veles taunts Perun and flees, transforming himself into various animals, hiding behind trees, houses, or people. In the end, he is killed by Perun, or he flees into the water, into the underworld. This is basically the same thing; by killing Veles, Perun does not actually destroy him, but simply returns him to his place in the world of the dead. Thus the order of the world, disrupted by Veles's mischief, is established once again by Perun. The idea that storms and thunder are actually a divine battle between the supreme god and his arch-enemy was extremely important to Slavs, and continued to thrive long after Perun and Veles were replaced by the Сhristian God and Devil. A lightning bolt striking down a tree or burning down a peasant's house was always explained through the belief of a raging heavenly deity bashing down on his earthly, underworldly, enemy.

The enmity of the two gods was explained by Veles' theft of Perun's cattle, or by Perun's theft of Veles' cattle (since Veles was the god of cattle, the matter of ownership here is not clear). The motif of stealing divine cattle is also a common one in Indo-European mythology; the cattle in fact may be understood simply as a metaphor for heavenly water or rain. Thus, Veles steals rain water from Perun, or Perun steals water for rain from Veles (again, since Veles is associated with waters, and Perun with sky and clouds, it is unclear to whom rain should belong). An additional reason for this enmity may be wife-theft. From folklore accounts it seems that the Sun was sometimes considered to be Perun's wife (an odd idea, as all Slavic sun-gods, like Hors and Daž bog, are male). However, since the Sun, in the mythic view of the world, dies every evening, as it descends beyond the horizon and into the underworld where it spends the night, this was understood by Slavs as Veles' theft of Perun's wife (but again, the rebirth of the Sun in the morning could also be understood as Perun's theft of Veles' wife).