These stories of the transformed beast are usually mythological, although some have a basis in local histories, religions and cults. In 425 BC, Greek historian Herodotus described the Neuri, a nomadic tribe of magical men who changed into wolf shapes for several days of the year. The Neuri were from Scythia, land that is now part of Russia. Using wolf skins for warmth is not outside the realm of possibility for inhabitants of such a harsh climate: this is likely the reason Herodotus described their practice as “transformation”.

The werewolf myth became integrated with the local history of Arcadia, a region of Greece. Here, Zeus was worshipped as Lycaean Zeus (“Wolf Zeus”). In 380 BC, Greek philosopher Plato told a story in the Republic about the “protector-turned-tyrant” of the shrine of Lycaean Zeus. In this short passage, the character Socrates remarks: “The story goes that he who tastes of the one bit of human entrails minced up with those of other victims is inevitably transformed into a wolf.”

Literary evidence suggests cult members mixed human flesh into their ritual sacrifice to Zeus. Both Pliny the Elder and Pausanias discuss the participation of a young athlete, Damarchus, in the Arcadian sacrifice of an adolescent boy: when Damarchus was compelled to taste the entrails of the young boy, he was transformed into a wolf for nine years. Recent archaeological evidence suggests that human sacrifice may have been practised at this site.