Zmey Gorynych is THREE-headed for a reason and it's not random

russian/east-slav byliny. Zmey Gorynych — the dragon Dobrynya Nikitich fights at the Puchai river. everyone draws him 3-headed, sometimes 6, 9, 12, but classically 3. breathes fire, flies, lives in the Sorochinsky mountains, kidnaps women (takes Prince Vladimir's niece Zabava Putyatichna). here's w……