Family tree of Cayetana Fitz-James Stuart, 18th Duchess of Alba

María del Rosario Cayetana Fitz-James Stuart y Silva, 18th Duchess of Alba GE was one of the most senior aristocrats in Spain, as well as the most titled aristocrat in the world.

Cayetana Fitz-James Stuart, 18th Duchess of Alba married Don Luis Martínez de Irujo y Artázcoz. Six children were born of this marriage:

Carlos Fitz-James Stuart, 19th Duke of Alba (born 2 October 1948, Madrid)
Alfonso Martínez de Irujo y Fitz-James Stuart, 18th Duke of Híjar (born 22 October 1950, Madrid)
Jacobo Fitz-James Stuart y Martínez de Irujo, 23rd Count of Siruela (born 15 July 1954, Madrid)
Fernando Martínez de Irujo y Fitz-James Stuart, 11th Marquis of San Vicente del Barco (born 11 July 1959)
Cayetano Martínez de Irujo y Fitz-James Stuart, 4th Duke of Arjona, 13th Count of Salvatierra (born 4 April 1963, Madrid)
Eugenia Martínez de Irujo, 12th Duchess of Montoro (born 26 November 1968)