These Lands

He ran out of money on the road home. The king supposedly drowning Cairo in gold sold back at half price the goods he had bought at a premium, and borrowed; Ibn Khaldun puts fifty thousand dinars on one Cairo merchant house alone, and reports the loans unpaid or part-paid. Both halves of the sentence everyone knows are wrong. Musa I of Mali was not measurably the richest man who ever lived: the figure that circulates is a modern net-worth extrapolation, and the medieval authority under it is a Majorcan map of about 1375 whose caption calls a crowned Black king the richest and the noblest of these lands. A regional claim, read as a global one for six hundred years.

The caravan entered Cairo on 19 July 1324 and left on 18 October. In those ninety days Mamluk officials took the king's gifts and took notes, and about twelve years later the chancery official al-Umari wrote them up from interviews with the men assigned to him. That is very nearly the entire documentary record. Mansa Musa left no chronicle, no inscription, no likeness made from life, no tomb, not one word in his own hand. The early chapters belong to the world that produced him: Ghana as al-Bakri described it from Cordoba in 1068 without ever going there; the goldfields of Bure and Bambuk, washed by people who were never Malian subjects and never conquered; Taghaza, where enslaved miners cut salt from a dry lakebed in a settlement roofed with camel skin. Mali taxed the road and not the mine, which is why the wealth could be walked around when Portuguese caravels reached Arguin in the 1440s.

The evidence is graded on the page. The famous caravan figures are handled as magnitudes rather than counts. The Ta'rikh al-Fattash is excluded entirely. Enslaved people stay where the sources put them, in the goldfields, the salt mines and the caravan. Four times the book says we do not know: about the birth, the death, the burial and the face.