Yet, while every Harry Potter fan knows that Lupin is a werewolf, not many know how he became one. Lupin paused and then said, "It was Greyback who bit me." "What?" said Harry, astonished.

Harry Potter and the Prisoner of Azkaban ... made an enemy out of Fenrir Greyback. Fenrir is a notorious werewolf who is also a Voldemort supporter. Remus' father wanted to kill Fenrir because ...