Dukes of Aguiar Duques de Aguiar Created by Enrique IV, king of Castile First holder Álvaro Perez Osorio de Rojas Manrique, 1st marquess of Astorga * c. 1410 Records #3 Holders Family filter On/Off 1 Álvaro Perez Osorio de Rojas Manrique, 1st marquess of Astorga * c. 1410 2 Pedro Alvarez Osorio, 2nd marquess of Astorga, 3rd count of Trastamara * c. 1465 3 Álvaro Perez Osorio, 3rd marquess of Astorga * c. 1495 Corrections and Updates To suggest a correction or an update. Click Here