"Yig (the Father of Serpents) is a deity in H.P. Lovecraft's Cthulhu mythos. He appears as a serpent man, serpent with bat-like wings, or as a giant snake.

Yig first appeared in the story "The Curse of Yig", which was created by Zealia Bishop and almost completely rewritten by Lovecraft. Although Yig is easy to anger, he is easy to please as well. Yig often sends his serpent minions, the children of Yig, to destroy or transform his enemies." (wikipedia)