Zachary Hillander is the High King of the Sacor Clans. The younger brother of Prince Amilton, he was to govern Hillander Province, the southernmost of the twelve provinces, while Amilton reigned. Their father, King Amigast, changed the order of succession when he finally realized how cruel and his elder son was, and that he was incapable of leadership. Though Zachary had protested, he was eventually crowned king. Amilton's attempt at a coup was the climax of Green Rider. King Zachary, during the ball room dance event, encountered a person who wore the mirror mask and foresaw rains of arrows.