Ivan Bilibin, Baba Yaga, an illustration for a Russian fairy tale (1900s).
Key myth
Chief of Vladimir's idols at Kyiv in 980, with a silver head and gold moustache. Procopius, in the 6th century, wrote that Slavs revered one god, the maker of lightning. After conversion, Vladimir had the idol thrown into the Dnieper.
Where sources differ or caution applies. The 'Perun versus Veles' dragon-slaying myth is a modern reconstruction (Ivanov and Toporov, 1970s) from folklore and Indo-European comparisons.