Saarbrücken received town privileges in 1322. Count John I, vassal of the dukes of Lorraine, joined the Luxembourg king Henry VII of Germany on his campaign to Italy and fought with Henry's son John of Bohemia on the French side in the Hundred Years' War. His grandson, the last Count John II of Saarbrücken, likewise fought with the French in the 1356 Battle of Poitiers, where he and King John II of France were captured and until the 1360 Treaty of Brétigny imprisoned at Wallingford Castle. Vested with the Lordship of Vaucouleurs as well with the title of a Grand Butler of France, he nevertheless had to pawn large parts of his possessions to Archbishop Baldwin of Trier. With John's death in 1381 the male line ended again. As his daughter Johanna had married Count John I of Nassau-Weilburg in 1353, their son Philipp I inherited the County of Saarbrücken.