Doña María del Rosario Cayetana Fitz-James Stuart y de Silva , 18th Duchess of Alba de Tormes , Grandee of Spain ( 28 March 1926 -- 20 November 2014 ) , was head of the House of Alba and the third woman to hold the title in her own right .
María del Rosario Fitz-James Stuart y de Silva , ( 18th ) Duchess of Alba de Tormes , Grandee of Spain ( 28 March 1926 -- 20 November 2014 ) was a Spanish aristocrat . She was the head of the House of Alba .