Dukes of la Conquista-I Duchi della Conquista-I Created by Charles VI, Holy Roman Emperor Decree date 1735 First holder Pedro de Castro Figueroa y Salazar, 1. duque de la Conquista * 1678 Records #4 Holders Family filter On/Off 1 Pedro de Castro Figueroa y Salazar, 1. duque de la Conquista * 1678 2 Bernardo de Castro y Azcárraga, 2. duque de la Conquista 3 Pedro de Castro y Loynaz, 3. duque de la Conquista 4 José María de Villarroel e Ibarrola, 1st Duque de la Conquista, 12nd marquess of los Palacios * c. 1795 Corrections and Updates To suggest a correction or an update. Click Here