County of Foix
Henry III of Navarre became King Henry IV of France in 1589. In 1607, he united to the French crown his personal fiefs that were under French sovereignty (i.e. County of Foix, Bigorre, Quatre-Vallées, and Nébouzan, but not Béarn and Lower Navarre, which were sovereign countries outside of the kingdom of France), and so the county of Foix became part of the royal domain.