Ansem the Wise

Ansem the Wise is the sage-king of Radiant Garden during Kingdom Hearts Birth by Sleep. In order to protect his people from the darkness, he spent much of his time studying the heart with his apprentices (Braig, Dilan, Even, Aeleus, Ienzo, and Xehanort), but was eventually exiled to the Realm of Nothingness when they were corrupted by that same darkness. He himself gained dark powers and renamed himself DiZ and set out on a quest to avenge himself against his apprentices throughout Kingdom Hearts: Chain of Memories, Kingdom Hearts 358/2 Days, Kingdom Hearts II, Kingdom Hearts 3D: Dream Drop Distance.