In Slavic mythology, Perun is the highest god of the pantheon and the god of sky, thunder, lightning, storms, rain, law, war, fertility and oak trees. His other attributes were fire, mountains, wind, iris, eagle, firmament, horses and carts, and weapons. The supreme god in the Kievan Rus' during the 9th-10th centuries, Perun was first associated with weapons made of stone and later with those of metal.