A great-nephew and nephew of two Bishops of Lisieux, he held the office of archdeacon in that diocese before serving successively Thomas Becket, the Archbishop of Canterbury and King Henry II of England. Diplomatic successes earned him the nomination to Coventry, but diplomatic missions after his elevation led to a long delay before he was consecrated. After King Henry's death, Nonant served Henry's son, King Richard I, who rewarded him with the office of sheriff in three counties.