The Valois, originally pagus valensis, was a region in the valley of the Oise river in Picardy in the north of France. It was a fief in West Francia and subsequently the Kingdom of France until its counts furnished a line of kings, House of Valois, to succeed the House of Capet in 1328. It was, along with the counties of Beauvais, the Vexin, Vermandois, and Laon, part of the "Oise line" of fiefdom which were held often by one individual or by an individual family as a string of defences against Viking assault on Paris.
The medieval county and duchy of Valois was located in northern France in northeastern Île-de-France. Its capital was Crépy-en-Valois.
Pepin I or Pepin, Count of Vermandois and Valois (ca. 886–892), son of Bernard, King of Italy.Pepin II or son of previous, count of Vermandois and Valois.Pepin III son of previous, count of Valois.Adela daughter of previous, countess of Valois, wife of Waleran II (or Gauthier II), count of Vexin and Amiens.Waleran, count of the Vexin, died 956, became count of Amiens in right of his wife Adela, married 923
956–987 Walter I, also count of the Vexin and Amiens987–1017/24 Walter II the White, also count of the Vexin and Amiens1017/24–1038 Ralph III1063–1074 Ralph IV, also count of the Vexin and Amiens after 1063, whose third wife was Anne of Kiev, dowager queen of France (that marriage was childless)1074–1077 Simon, also count of the Vexin and AmiensTo the royal domain in 1076 or 1077.
Herbert IV (–1080), Count of Vermandois and also count of Valois by marriage with Adela or Alix, daughter of Raoul II count of Vexin and Valois.Eudes 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 Magnus.Hugh I the Great (1085–1101), Count of Vermandois and of Valois, son of Henry I and Anne of Kiev.Raoul I the Valiant (1102–1152), also known as Le Borgne, Count of Vermandois and of Valois, son of previous.Hugh II (1152–1160), Count of Vermandois and of Valois, son of Raoul I and Eléonore of Blois.Raoul II (1160–1167), Count of Vermandois and of Valois, son of Raoul I and of Petronilla of Aquitaine.Philip of Alsace (1167–1185), Count of Flanders (1168–1191), Count of Vermandois and of Valois by marriageto the royal domain by king Philip II
Jean-Tristan (1269–1270)in royal domainCharles I (1284–1325)Philip I (1325–1328)in royal domainPhilip II (1344–1375)in royal domainLouis I (1386?–1406)Charles d'Orléans (1406–1465)Louis (1465–1498)in royal domainFrançois (Duke 1498-1515, King of France as Francis I, 1515-1547)in royal domainMarguerite de Valois (died 1615)in royal domainGaston (1626–1660)Jean Gaston d'Orléans (1650–1652)Philippe de France (1660–1701)Philippe Charles d'Orléans (1664–1666)Alexandre Louis d'Orléans (1673–1676)Philippe d'Orléans (1701–1723)Louis d'Orléans (1723–1752)Louis Philippe d'Orléans (1752–1785)1773-1785 :Louis Philippe d'Orléans (1773–1850)Philippe d'Orléans (1785–1793)Louis Philippe d'Orléans (1773–1850) 
