The Two Brothers
The many-headed serpent enemy shares similarities with Greek mythic creature Hydra, defeated by Heracles as part of his Twelve Labors. An episode of a battle with the dragon also occurs in several fairy tales: The Three Dogs, The Two Brothers, The Merchant (fairy tale), The Bold Knight, the Apples of Youth, and the Water of Life, The Three Princes and their Beasts, The Thirteenth Son of the King of Erin, Georgic and Merlin, the epic feats of Dobrynya Nikitich, the Polish legend of the Wawel Dragon.