Lycaon

History
Lycaon was once a mortal king of Arcadia, son of Pelasgus and Meliboea. He tested Zeus, who was a guest, by serving him human meat. Also he ordered a murder on Zeus while he slept, to test his immortality. Zeus became angry because of this and turned Lycaon into a wolf and killed all of his fifty sons. The Greeks named werewolves lyncanthropes, after him, the first werewolf.

The Lost Hero
Jason Grace, Piper McLean and Leo Valdez met Lycaon while searching for the home of Aeolus. He is ordered to kill them, except for Jason, who he is ordered to kidnap. The Hunters of Artemis stopped Lycaon and his minions, and he fled.