The Crown of Aragón was a medieval kingdom that emerged in the 12th century, encompassing regions in modern-day Spain and Italy. It was formed through the union of the Kingdom of Aragón and the County of Barcelona, expanding its influence across the Mediterranean. The crown played a significant role in the political and cultural landscape of medieval Europe. The Crown of Aragón was known for its maritime power and trade networks, particularly in the Mediterranean Sea. It established a unique legal system and promoted the use of the Catalan language. The crown eventually merged with the Crown of Castile in the late 15th century, leading to the unification of Spain.