Marquesses of Castronuevo Marqueses de Castronuevo Records #2 Holders Family filter On/Off 9 Diego Ventura de Guzmán y Fernández de Córdova, 14th count of Oñate * 1738 Carlos Jordan de Urries y Gasset, marquess of Castronuevo * 1990 Corrections and Updates To suggest a correction or an update. Click Here