Merlin

Sir Merlin was an gem sorceror from over 5,000 years ago. He's the court wizard of King Arthur, an valuable member of the Knights of the Round Table. Guided and tutored Arthur since his childhood, became an legendary figure in Earth's lore. Merlin was captivated by Camelot's terrain and life, and soon vowed to protect the land. Using his foresight he'd pathed a way for King Arthur's ultimate destiny and fate. He'd also participated in the war against thee Saxons and the Four Homeworld Gems of the Saxons, and was later revealed that his true identity is that of Orange Diamond, one of the lost patriarchs of the Great Diamond Authority.