William had become a very skilled knight and after his ramsom he became part of Henry II’s household, teaching men to fight. He became tutor, guardian, protector and friend to the son of Henry II, known historically as Henry the Young King. When young Henry was coronated, Marshal was assigned to serve him as captain of the guard and chief of the knights. It was Marshal who would knight the young King Henry. Marshal also accompanied young Henry on many tournaments. In 1173 young Henry argued with his father. He wanted to assume the throne of England even though his father was still alive. He left England and took his brother Richard with him to his mother's lands in Aquitaine. In 1174, Henry II and his son made peace. William continued on to win fame in tournaments. The young king became ill and died of a sudden disease at Martel on 11 June 1183.