Birth of Fernando the Catholic Historical milestone · Sos del Rey Católico, Cinco Villas, Zaragoza Image of Sos del Rey Católico, not of the place itself. Juana Enríquez gave birth in Sos, in March 1452, to the future Fernando II of Aragon, in the middle of the Navarrese civil war. The birth took place in the palace of Sada and from then on the villa added to its name the epithet del Rey Católico. 1452 Photo: Txemari. (Navarra). (CC0) What to see and do in Sos del Rey Católico