Sankore Mosque and University of Timbuktu
At its height during the Songhai Empire (15th–16th centuries), Sankore functioned as a university with an estimated 25,000 students studying astronomy, mathematics, medicine, jurisprudence, rhetoric, and theology. Libraries held between 400,000 and 700,000 manuscripts. The institution was not a single building but a network of scholars, mosques, and private libraries constituting one of the largest concentrations of written knowledge in the pre-modern world.
The Moroccan invasion of 1591 destroyed much of the collection and broke the continuity of the institution, a deliberate act of military conquest targeting the empire’s intellectual infrastructure.