In 1324, Mansa Musa, ruler of the Mali Empire, departed on a hajj to Mecca with a caravan estimated at tens of thousands of people and multiple tonnes of gold. Traveling through Cairo, he met Mamluk sultan al-Nasir Muhammad and distributed gold so extensively that Arab historian al-Umari documented a decline in gold's value in Egypt lasting approximately twelve years. The pilgrimage introduced Mali's wealth to the Islamic world and Europe, where Mansa Musa appeared on the 1375 Catalan Atlas. Upon his return, he commissioned mosques and attracted scholars to Timbuktu.