The Almoravid dynasty (Arabic: المرابطون) was an imperial Muslim dynasty centered in the territory of present-day Morocco. It established an empire in the 11th century that stretched over the Maghreb and Al-Andalus, starting in the 1050s and lasting until its fall to the Almohads in 1147. The Almoravid capital was Marrakesh, a city founded by the Almoravid leader Abu Bakr ibn Umar c. 1070. The dynasty emerged from a coalition of the Lamtuna, Gudala, and Massufa, nomadic Berber tribes living in Morocco and what is now Mauritania, traversing the territory between the Draa, the Niger, and the Senegal rivers.
The Almoravids were crucial in preventing the fall of Al-Andalus (Muslim rule in Iberia) to the Iberian Christian kingdoms, when they decisively defeated a coalition of the Castilian and Aragonese armies at the Battle of Sagrajas in 1086. This enabled them to control an empire that stretched 3,000 km (1,900 mi) north to south. Their rulers never claimed the title of caliph and instead took on the title of Amir al-Muslimīn ("Prince of the Muslims") while formally acknowledging the overlordship of the Abbasid Caliphs in Baghdad. However, the rule of the dynasty was relatively short-lived. The Almoravids fell—at the height of their power—when they failed to stop the Masmuda-led rebellion initiated by Ibn Tumart. As a result, their last king Ishaq ibn Ali was killed in Marrakesh in April 1147 by the Almohad Caliphate, which replaced them as a ruling dynasty both in the Maghreb and Al-Andalus.