Gaspard de Coligny, seigneur de Châtillon, was a French nobleman, Admiral of France, and Huguenot leader during the French Wars of Religion. He served under kings Francis I and Henry II during the Italian Wars, attaining great prominence both due to his military skill and his relationship with his uncle, the king's favourite Anne de Montmorency. During the reign of Francis II he converted to Protestantism, becoming a leading noble advocate for the Reformation during the early reign of Charles IX.