In Slavic mythology, Perun (Cyrillic: Перун) is the highest god of the pantheon and the god of thunder and lightning.
His other attributes were fire, mountains, the oak, iris, eagle, firmament (in Indo-European languages, this was joined with the notion of the sky of stone), horses and carts, weapons (the axe (Axe of Perun) and arrows), and war. He was first associated with weapons made of stone and later with those of metal.
Like many other Indo-European thunder gods, Perun’s vegetative hypostasis was the oak, especially a particularly distinctive or prominent one. In Southern Slavic traditions, marked oaks stood on country borders; communities at these positions were visited during village holidays in the late spring and during the summer. Shrines of Perun were located either on top of mountains or hills, or in sacred groves underneath ancient oaks. These were a general place of worship and holding of sacrifices (with a bull, an ox, a ram, and eggs).