The comté de Valois (originally called pagus valensis was a comte centered on Vez, (in latin Vadum) then Crépy-en-Valois. The first hereditary owners were the Hebertiens, Counts of Vermandois, who transmitted it via mariage to the Capetiens. It was then given as appanage to several princes: Hugues, son of Henri I, and Jean-Tristan, son of King Louis IX.
Charles de Valois (1270-1325), son of Philppe III the Bold, received Valois as appanage and founded the House of Valois, which ruled France starting with his son Philippe VI de Valois, King of France in 1328. The latter left the county to his son Philippe, Duke of Orleans. After his death without issue, it became the property of Louis, Duke of Orleans, brother of Charles VI, and founder of the Valois-Orleans branch. When Louis's grandson Louis II of Orleans became King under the name Louis XII, Valois, now a Duchy, went to his cousin, François of Angoulême, the future François I of France. Valois then became part of the Royal Domain.