On August 18, 1443, he was elected Master of the Order of Calatrava[7] and dismissed on September 19, 1445, replaced by Pedro Girón.[8] Received the title of count of Ribagorza by his father John II in Monzón,[n. 2] and resigned on November 27, 1469, to be succeeded by his first son Fernando.[9]
The premature death of his eldest son, Fernando, at the age of three years in 1481, would make the duchy passed to the second son of the marriage: Alfonso, who would inherit the duchy at 16 years in 1485.
^Don Alonso, bastardo de Juan II, conde de Ribagorza (1469–1477).
^«Being held to king to the court of the Aragonese in the town of Monzon on 27 of November of this year 1469, as to own county of Ribagorza on behalf of his son the King of Sicily [or the former Count of Ribagorza and helpful county gentleman][...] donated to his son Don Alonso de Aragón of that county, entitled count, with the consent and will of the entire county.[...] and had his predecessors, for him and his legitimate children." Alonso de Aragón, the third of its name in the Ribagorzana line, was the bastard son of King John II of Aragon and Leonor de Escobar.Costa 2001, p. 275
^The Duchy of Luna is a Spanish noble title created in 1495 by the King of Aragon, Fernando II, in favor of his nephew, Juan Jose de Aragon and Sotomayor, 4th count of Ribagorza, Viceroy of Naples and Catalonia.
^Francisco José Morales Roca (1999). Prelados, abades mitrados, dignidades capitulares y caballeros de las Ordenes Militares habilitados por el brazo eclesiástico en las Cortes del Principado de Cataluña: dinastía de Trastamara y de Austria : siblos XV y XVI (1410–1599) (in Spanish). Madrid: Ediciones Hidalguia. pp. 87, 90. ISBN978-84-89851-15-3.