The medieval county and duchy of Valois was located in northern France. It was included in the northeastern part of the government of Île-de-France, while being part of the province of Picardy.[3] Its capital was Crépy-en-Valois.[4]
Odo I the Insane (1080–1085), Count of Vermandois and of Valois, son of previous, he was disinheredited by the council of Barons of France and then he was lord of Saint-Simon by marriage.
Adelaide – sister of previous, countess of Vermandois and Valois, wife of Hugh.
Other Valois branches are: the dukes of Alençon, descendants of Charles, a younger son of Charles I, count of Valois; the Dukes of Anjou, descendants of Louis, the second son of King John II; and the dukes of Burgundy, descendants of Philip, the fourth son of the same king.[6]
Anselme, (Père), Histoire généalogique et chronologique de la Maison Royale de France, des pairs, grands officiers de la couronne & de la maison du Roy, 1726.
Fouquier-Cholet, Eloi, Q.A. Histoire des comtes héréditaires de Vermandois, Saint-Quentin, 1832.
Mabillon, Jean, Annales ord. Sancti Benedicti. Ticinense. Lucae, 1739.
Moreri, Louis, Le Grand Dictionnaire Historique, Paris, 1743–1749.