The Château de Pau dominates the Gave de Pau. Its two oldest towers date from the 12th century. The quadrangular tower of brick was raised by Sicard de Lordat in the 14th century. Thus constituted fortress was turned into a Renaissance palace by Marguerite d'Angoulême and then restored under Louis-Philippe and Napoleon III. In summary, the castle was fortress of the Viscounts of Béarn, Castle of Fébus, birthplace of the good King Henry IV ("Nouste Enric") and royal residence in the Renaissance.