 He is sometimes numbered Frederick V by continuity with the Dukes of Lorraine.In 1445, he married his cousin Yolande of Anjou (1428–1483), daughter of René I of Anjou, (King of Naples, Duke of Anjou, of Bar and of Lorraine, Count of Provence), and of Isabelle, Duchess of Lorraine.This marriage put an end to the litigation which existed between the fathers of the bride and groom, in connection with the succession of the Duchy of Lorraine.