Fals - Ishaq bin Hasan

Kilwa Sultanate fals coinage of this period remains among the most archaeologically significant copper currency from sub-Saharan Africa, recovered in quantity from the ruins of Husuni Kubwa and at coastal trading sites stretching from Mozambique to the Comoros. Ishaq bin Hasan's precise place in the Kilwa dynastic sequence is disputed — the sultans of this era are poorly documented outside of Ibn Battuta's earlier visit and the contested Portuguese accounts that followed Vasco da Gama's arrival in 1498.

The copper itself was almost certainly imported, as the Swahili coast held no significant local copper deposits.