Ivan Bilibin, Baba Yaga, an illustration for a Russian fairy tale (1900s).
Key myth
In the Primary Chronicle, oaths are sworn by Perun and by Volos, 'god of cattle'. Veles is later linked with the underworld by the reconstructionist model.
Where sources differ or caution applies. Whether Veles and Volos are the same god and his link to the underworld are scholarly arguments.
Deities in other traditions who share a theme with Veles / Volos: earth, harvest and fertility, death and the underworld, trickery, boundaries and travel. This is overlap in one area only.