Kingdom of Castile
13th century: definitive union with the Kingdom of León

Alfonso VII restored the royal tradition of dividing his kingdom among his children. Sancho III became King of Castile and Ferdinand II, King of León.

The rivalry between both kingdoms continued until 1230 when Ferdinand III of Castile received the Kingdom of León from his father Alfonso IX, having previously received the Kingdom of Castile from his mother Berenguela of Castile in 1217. In addition, he took advantage of the decline of the Almohad empire to conquer the Guadalquivir Valley whilst his son Alfonso X took the taifa of Murcia.

The Courts from León and Castile merged, an event considered as the foundation of the Crown of Castile, consisting of the kingdoms of Castile, León, taifas and other domains conquered from the Moors, including the taifa of Córdoba, taifa of Murcia, taifa of Jaén and taifa of Seville.
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