Champeaux is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France. Birhplace of William of Champ…Champeaux is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France. Birhplace of William of Champeaux, canon of the cathedral of Notre-Dame. The inhabitants are called Campéliens.