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
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Vilafermosa