The Duchy of Vilafermosa is a line of dukes in Aragón, originated in 1476 by King John II of Aragón whose members bear the family name of Aragó. The first duke was a bastard of John II called Alfons d'Aragó (Alphonse of Aragó). Dukes: Alphonse I until 1485 Alphonse II 1485-1513 John I 1513-1528 Alphons III 1528-1550 Martí 1550-1581 Aldonça, sister of Martí; she originated the family of Azlor, titled Dukes of Vilafermosa Ferran I 1581-1592 María Luisa (duchess), daughter of Ferran I; she originated the families named Borja and Aragó-Gurrea, titled Dukes of Vilafermosa, by union to the descents of the last duchess Francesc I 1592-1622 Joana-Lluisa 1622–1652, daughter of Francesc I, she originated the families Borja and Aragó-Gurrea. References Vilafermosa