Carretera de Gallur a Sangüesa, 50680 Sos del Rey Católico, Spain

It was the birthplace of King Ferdinand II (1452), in whose honor the town, formerly known simply as Sos, took the name del Rey Católico (of the Catholic King). It is one of the best preserved medieval cities in Aragon; large parts of the old town are said to look much like they did at the time of Ferdinand’s birth. The many monuments in the town include: the Palacio de los Sada, birthplace of the Catholic Monarch; several churches, including the gothic church of Saint Stephen; the old medieval wall and seven of its gates; and the medieval stock exchange (Lonja).