Overview
Alfonso de Aragon y Escobar (1417–1485), Duke of Villahermosa, Count of Ribagorza and Cortes and Grand Master of the Order of Calatrava, was an illegitimate son of John II of Aragon and one of his mistresses, Leonor de Escobar, daughter of Alfonso Rodríguez de Escobar.
From Wikipedia (CC BY-SA 4.0).