Marquesses of Valle Siciliana Marqueses de Valle Siciliana First holder Fernando de Alarcón, 1st marquess of Valle Siciliana Records #2 Holders Family filter On/Off 1 Fernando de Alarcón, 1st marquess of Valle Siciliana 2 Pedro Gonzalez de Mendoza * 1466 Corrections and Updates To suggest a correction or an update. Click Here