Kilwa Kisiwani, a Swahili trading city
Kilwa Kisiwani, on an island off the coast of Tanzania, was one of the great Swahili port cities. It reached its height in the 13th and 14th centuries, when gold and ivory from the interior were traded across the Indian Ocean for goods from Arabia, India and China. Kilwa minted its own coins from the 11th to the 14th centuries. The traveller Ibn Battuta visited in 1331–1332. Its decline began after the Portuguese built a fort there in the 16th century.