 They also expanded their territory into the old Bavarian lands west of the Enns River, along the Traun to the city of Linz, the future capital of Upper Austria.In 1191 Duke Leopold V joined the Third Crusade and the Siege of Acre.Once the city was conquered and occupied, he picked a fierce quarrel with King Richard the Lionheart, allegedly over Leopold's raising of his Babenberg banner beside the royal flags of Richard and Philip II of France.