100,000 lined the streets as the Duke of Alba ' s daughter is wed . About a 100 , 000 people assembled in and near Seville Cathedral for the wedding of Cayetana Fitzjames Stuart , Duchess of Montoro , 21 year old daughter of the Duke of Alba , to Dom Lius Martinez de Irujo , 27 year old son of the Duke of Sotomayor . Photo shows ; Some of the notables who attended the wedding. Front row , left to right ; The Infante Don Alfonso de Orleans y Bourbon , cousin of the late King of Spain ( Alfonso the thirteenth ). the Infante Mercedes de Baviere and Isabel Alfonso de Bourbon . 12 October 1947