The Zuda (or Azuda) was the seat of Moorish governors and was built on one of the towers of the Roman wall, by the River Ebro. After the Reconquest (1118 by King Alfonso I) the building became a palace, the residence of the Kings of Aragón until Jaime I in the 13th century. This king was imprisoned with his wife during an uprising of the Aragonese nobility. The present building, restored by Francisco Iñiguez, does not retain any medieval elements and dates only to the 16th century. Now it is the Tourist Information Office.