The Kingdom of Aragon (Aragonese: Reino d'Aragón; Catalan: Regne d'Aragó; Latin: Regnum Aragoniae; Spanish: Reino de Aragón) was a medieval and early modern kingdom on the Iberian Peninsula, corresponding to the modern-day autonomous community of Aragon, in Spain.

Aragon was originally a Carolingian feudal county around the city of Jaca, which in the first half of the 9th century became a vassal state of the kingdom of Pamplona (later Navarre), its own dynasty of counts ending without a male heir in 922.

Gonzalo was killed soon after and all the land he owned went to his brother Ramiro, thus becoming the first de facto king of Aragon,[4] although he never used that title.

[5] As the Aragonese domains expanded to the south, conquering land from Al Andalus, the capital city moved from Jaca to Huesca (1096), and later to Zaragoza (1118).

The Crown of Aragon became a part of the Spanish monarchy after the dynastic union with Castile, which supposed the de facto unification of both kingdoms under a common monarch.

[7] In 1479, upon John II's death, the crowns of Aragon and Castile were united to form the nucleus of modern Spain.

Aragonese territories retained their autonomous parliamentary and administrative institutions, such as the Corts, until the Nueva Planta decrees, which were promulgated between 1707 and 1715 by Philip V of Spain in the aftermath of the War of the Spanish Succession.