For 10 points, identify this Spanish region, whose king Ferdinand unified Spain by marrying Isabella of Castile.
This kingdom established its capital at Zaragoza under Alfonso I's rule. This kingdom fought a war with the French Angevin dynasty that was sparked by the Sicilian Vespers. Alfonso V's wars in Italy helped add Naples to its territories. Its most famous king issued the Alhambra decree with his wife, with whom he oversaw the completion of the reconquista. For 10 points, identify this Spanish region, whose king Ferdinand unified Spain by marrying Isabella of Castile.
This kingdom established its capital at Zaragoza under Alfonso I's rule.
Aragon