Guillaume d'Ercuis

Guillaume d'Ercuis (1265 — 1314/15 [His will is dated 1314.] ) was the aumônier to Philip III of France and the tutor of Philip IV. He was a royal notary, and, as one of the King's men, a canon of the cathedrals of Laon, Noyon, Senlis, Mello, Marchais and of Reims, archdeacon of Laon and of Thiérache. 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 the Virgin Mary, served by the monks of the Abbey of Sainte-Geneviève, Paris.

Guillaume d'Ercuis kept a journal, his "livre de raison" [Conserved in the Bibliothèque Sainte-Geneviève, Paris, ms. 2025; edited and published by Joseph Petit, "De libro rationis Guillelmi de Erqueto", (Paris) 1900.] noting his expenses for the purchase of domains, of furnishings and books. Some annotations relate to his personal life and to court life.

His descendent, H.Coustant d'Yanville, published a "Notice sur Guillaume d'Ercuis, précepteur de Philippe le Bel", (Beauvais 1864).

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* [http://aedilis.irht.cnrs.fr/jeudis9900/jeudis_problematique_det3.htm Guillaume d'Ercuis, "Livre de raison"