What if southern Spain were still an Islamic emirate? On this day (25 November) in 1491, the Treaty of Granada was signed and ratified by Boabdil, the last sultan of the Emirate of Granada, and Ferdinand and Isabella, the King and Queen of Castile, León, Aragon, and Sicily, who completed the “Reconquist of Spain”. (Here is an English-language translation of the treaty.) Among other things, this treaty decreed a truce between the warring parties, followed by the relinquishment in January 1492 of the sovereignty of the Muslim Emirate of Granada (founded in the 13th century) to the Catholic monarchs of Spain.