Which noble helped rule England while the king was away leading the Third Crusade?

While King Richard I was away leading the Third Crusade, his brother John, along with other nobles, attempted to rule England. However, the primary figure overseeing the kingdom during Richard's absence was William Longchamp, the Bishop of Ely, who served as the Chancellor. Longchamp faced significant opposition, particularly from John and other barons, which led to political turmoil during this period.