Yusuf I of Granada

Yusuf I (1318–1354), seventh Nasrid sultan of Granada, came to the throne at fifteen in 1333 after his brother Muhammad IV was murdered, at first ruling in name only under his grandmother Fatima. In 1334 his envoys secured a four-year peace with Castile and the Marinids.

When it lapsed he allied with the Marinids against Alfonso XI of Castile, and the allies were crushed at the Río Salado in 1340; Algeciras fell in 1344. When Alfonso died of the Black Death outside Gibraltar in 1350, Yusuf ordered his commanders not to attack the Castilians carrying their king's body home, then made peace with Peter I.

Granada lost ground yet flourished under him: he founded the Madrasa Yusufiyya and enlarged the Comares Palace, with Ibn al-Khatib as his vizier. He was stabbed while praying in the Great Mosque on Eid al-Fitr in 1354, and his son Muhammad V succeeded him.