sentences:  He derived his name from his small "seigneurie" of Ercuis (Old French "Arcuys" or "Erquez"; Latin "Arquetum") in the Beauvaisis between Neuilly-en-Thelle and Cires-lès-Mello, about 55 km from Paris.At Ercuis he erected a chapel dedicated to Virgin Mary, served by the monks of the Abbey of St Genevieve, Paris.His parents were Guillaume d’Ercuis (1240-1302) and Helisende.