Mansa Musa Spent So Much Gold in Cairo It Devalued the Currency for 12 Years
An Arab historian, writing in 1337, was still measuring the dent the Mali king's three-month visit had left in the Cairo dirham.
On July 19, 1324, the king of Mali crossed the Nile into Cairo with an entourage that camped for three days near the pyramids before entering the city. He stayed about three months. By the time Mansa Musa left for Mecca on October 18, the price of gold in Cairo had collapsed.
The Arab historian Al-Umari, writing around 1337, gives the cleanest numbers. Before Musa's arrival, a mithqal of gold traded for at least 25 silver dirhams. After his stay, it sat below 22 — and was still there twelve years later, when Al-Umari was writing it down. He had it from Ibn Amir Hajib, a Cairo official who'd befriended Musa and his retinue.
Musa wasn't trying to crash a currency. He was paying his respects to emirs, gifting officials, and buying out Cairo's markets with what he had. What he had was an empire that controlled the gold fields of the upper Niger. Estimates of the load he carried run to roughly 18 tons.
Not every economic historian buys the catastrophe story. Warren Schultz has argued the dip fits inside the normal noise of Mamluk monetary records — Egypt's gold price wandered for lots of reasons, and a single visit doesn't fully explain a twelve-year trough.
The more durable consequence wasn't monetary. It was reputational. Musa's hajj is the moment Mali shows up on European maps: the 1375 Catalan Atlas draws him on his throne in West Africa, holding a gold nugget the size of a fist. For a continent that had barely heard the name Timbuktu, that picture took a long time to fade.
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