Seville Cathedral: Santa Maria de la Sede Was the mosque of Abu Ya'Kub Yusuf - built in 1171 et seq. Present building begun 1402 - practically finished in 1506 Dome collapsed in 1511 - rebuilt from plans by Juan Gil de Hontanon in 1512-1517. Extensive restoration begun in 1882 (vaulting had been weakened by earthquake shocks) under the supervision of Casanova Dome collapsed a second time in 1888. General view