The founding of the Mali Empire dates to the 1200s, when a ruler named Sundiata Keita—sometimes called the “Lion King”—led a revolt against a Sosso king and united his subjects into a new state. Under Keita and his successors, the empire tightened its grip over a large portion of West Africa and grew rich on trade. Its most important cities were Djenné and Timbuktu, both of which were renowned for their elaborate adobe mosques and Islamic schools. One such institution, Timbuktu’s Sankore University, included a library with an estimated 700,000 manuscripts. The Mali Empire eventually disintegrated in the 16th century, but at its peak it was one of the jewels of the African continent and was known the world over for its wealth and luxury.