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Yūsuf I was a ruler of the Naṣrid dynasty, which governed Granada from 1238 to 1492, making them the last Muslim dynasty in Spain. He reigned from 1333 to 1354. Yūsuf I began the construction of the Alhambra. His reign, along with that of Muḥammad V, saw Granada reach its greatest splendor. Despite efforts to maintain a balance of power between Christian Castile and North African empires, Yūsuf I was defeated at the Battle of Rio Salado in 1340. The Naṣrid dynasty ultimately fell in 1492 with the Christian conquest of Granada.123

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