Proto-Indo-European mythology realm of Midgard. Other dragon-slaying myths are also found in the Germanic tradition. In the "Völsunga saga", Sigurd slays the dragon Fafnir and, in "Beowulf", the eponymous hero slays a different dragon. Reflexes of the Proto-Indo-European dragon-slaying myth are found throughout other branches of the language family as well. In Zoroastrianism and Persian mythology, Fereydun, and later Garshasp, slays Zahhak. In Slavic mythology, Perun, the god of storms, slays Veles and Dobrynya Nikitich slays the three-headed dragon Zmey. In Armenian mythology, the god Vahagn slays the dragon Vishap. In Romanian folklore, Făt-Frumos slays the fire-spitting monster Zmeu. In Celtic mythology,
Investigations into Germanic Mythology concerning resemblances of Thor and Indra were carried to extremes, therefore receiving "less recognition than they deserved." Others refute individual points of the work. Still others have commented on what they see as fundamental flaws in Rydberg's methodology. While many modern scholars object to any systematization of the mythology including the one imposed by Snorri Sturlusson, believing it artificial, John Lindow and Margaret Clunies Ross have recently supported a chronological systemization of the most important mythic episodes as inherent in the oral tradition underlying Eddic poetry. Rydberg, however, believed that most of the Germanic myths could be fit into such