Kingdom of Aragon
Dynastic union with the County of Barcelona

The Kingdom of Aragon gave the name to the Crown of Aragon, created in 1150 with the dynastic union resulting from the marriage of the Princess of Aragon, Petronilla, and the Count of Barcelona, Ramon Berenguer IV. Their son Alfonso II inherited all of the territories ruled by his father and mother. The King of Aragon also held the title of Count of Barcelona and ruled territories that consisted of not only the present administrative region of Aragon, but also Catalonia, and later the kingdoms of Majorca, Valencia, Sicily, Naples and Sardinia.

The King of Aragón was the direct ruler of the Aragonese region, and held the titles of Count of Provence, Count of Barcelona, Lord of Montpellier, and Duke of Athens and Neopatria. Each of these titles gave him sovereignty over a certain region, and these titles changed as he won and lost territories. In the 14th century, his power was greatly restricted by the Union of Aragon.
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