The Valois are a branch of the Frankish royal family.
The Valois were distant cousins of Edward III, whom the Frankish Estates Generale chose instead of Edward.
Initially the Frankish crown was taken by Philippe VI de Valois. His son John was proposed as a husband for another sister of Charles II of Navarre—Blanche d’Evreux. However when Philippe met Blanche he was so taken by her beauty he married her himself. In 1355 Blanche was still the wild card in Frankish Politics and was in conflict with the Dauphin Charles. The dauphin also entered into separate agreements with Charles II, with the purpose of deposing his own father!
Edward III regarded Philippe de Valois and his successors as usurpers and always referred to him as such.