2. THE CROWN OF ARAGÓN -
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THE KINGDOM OF ARAGÓN AND THE COUNTY OF BARCELONA Until the early 11 th century the County of Aragón had belonged to the kingdom of Navarra. But Ramiro I declared himself ruler of the Kingdom of Aragón and little by little his sucessors expanded into the Ebro valley. The other key region in the east was the County of Barcelona, which became independent under Count Borrell II and gradually took control of the other catalan countries. Under king Alfonso I El Batallador,Aragón achieved control over central part of the Ebro valley and established its capital at Zaragoza. Alfonso I had no children and tried unsuccessfully to leave his territories to the military orders. But Navarra and Aragón chose separate rulers. In Aragón, his successor Ramiro II arranged for his daughter Petronila to marry Ramón Berenguer IV, Count of Barcelona, leading to the creation of the Crown of Aragón. Their son, Alfonso II of Aragón inherited both teritories becoming its first king. The Crown of Aragón was a federation. Its territories had the same king, but they each had their own cortes and completely separate laws and institutions.