The Aragonese Kings were the rulers of the Kingdom of Aragon, a medieval kingdom in northeastern Spain. This kingdom played a significant role in the history of the Iberian Peninsula, especially during the Reconquista, when Christian kingdoms sought to reclaim territory from Muslim rule. The most notable Aragonese king was Ferdinand II of Aragon, who united with Isabella I of Castile to form the basis of modern Spain. The Aragonese monarchy was characterized by its unique legal system and the establishment of the Cortes of Aragon, an early form of parliamentary assembly. The kingdom expanded its influence through strategic marriages and conquests, including the acquisition of Sicily and Naples. The Aragonese Kings contributed to the cultural and political landscape of medieval Europe.