Mansa Musa, ruler of the Mali empire, crossed the Sahara to Mecca in 1324 with an enormous caravan and distributed and spent so much gold in Cairo that its value in Egypt was depressed for years afterwards. He returned with scholars, books and craftsmen from the wider Muslim world, among them the Andalusi poet and jurist Abu Ishaq al-Sahili, whom later tradition credits with building work at Gao and Timbuktu. Musa commissioned the Djinguereber mosque at Timbuktu around 1327 along with mosques at Gao and a royal audience hall at Niani. Within decades Mali appeared on Mediterranean portolan charts and in the Catalan Atlas of 1375 as the source of Saharan gold.
The pilgrimage converted trans-Saharan trade wealth into durable urban investment, producing the monumental banco mosque-and-madrasa quarters that gave Timbuktu, Gao and Djenne their distinctive form and their role as centres of scholarship. It also fixed West African cities in the commercial imagination of Cairo, the Maghreb and Europe, drawing the caravan-city network into a wider urban system.
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