On 20 December 1920 , the Duke was married to María del Carmen Saavedra y de Collado , 13th Marquise of Villaviciosa ( daughter of José Saavedra y Salamanca , 2nd Marquis of Viana , Grandee of Spain ) , and they had one son Fernando Alfonso Fitz-James Stuart y Saavedra , born 24 January 1922 and died 20 July 1970 . The Duke of Peñaranda de Duero was slain by communists in the massacre of Paracuellos during November 1936 , and was succeeded in his titles by his only son . The Duchess died on 23 April 1967
massacre of Paracuellos
Paracuellos massacres
Hernando Fitz-James Stuart, 14th Duke of Peñaranda de Duero