Reconquista: The Muslim city of Algeciras surrendered after a 21-month siege and was incorporated into the Kingdom of Castile.

The Reconquista or the fall of al-Andalus was a series of military and cultural campaigns that European Christian kingdoms waged against Muslim-ruled al-Andalus, culminating in the reign of the Catholic Monarchs of Spain.

Algeciras is a city and a municipality of Spain belonging to the province of Cádiz, Andalusia. Located in the southern end of the Iberian Peninsula, near the Strait of Gibraltar, it is the largest city on the Bay of Gibraltar.

The siege of Algeciras (1342–1344) was undertaken during the Reconquest of Spain by the Castillian forces of Alfonso XI assisted by the fleets of the Kingdom of Aragon and the Republic of Genoa. The objective was to capture the city of Algeciras, called Al-Jazeera Al-Khadra by the Arabs who occupied it. The city was the capital and the main port of the European territory of the Marinid Empire.

The Kingdom of Castile was a polity in the Iberian Peninsula during the Middle Ages. It traces its origins to the 9th-century County of Castile, as an eastern frontier lordship of the Kingdom of León. During the 10th century, the Castilian counts increased their autonomy, but it was not until 1065 that it was separated from the Kingdom of León and became a kingdom in its own right. Between 1072 and 1157, it was again united with León, and after 1230, the union became permanent.