History[ edit ] A mention of the banya is found in the Radzivill Chronicle in the story of Princess Olga 's revenge for the murder of her husband, Prince Igor , by the Slavic tribe of Drevlians in AD. The leader of the Drevlians had hopes of marrying the widow Olga and sent messengers to discuss the idea. Supposedly the belief was held that Andrew crossed through East Slavic lands from the mouth of the Dnieper River , past the hills on which Kiev would later be founded, and went as far north as the ancient city of Novgorod. They warm them to extreme heat, then undress, and after anointing themselves with tallow, they take young reeds and lash their bodies. They actually lash themselves so violently that they barely escape alive.