Swahili Coast Indian Ocean Trade Boom (1140s)

Timeline

1. 1141–1145Indian Ocean · East African coastArab and Persian merchant ships traveled back and forth to East African ports following the monsoon patterns, transporting goods from the western Indian Ocean, the Red Sea, and the Persian Gulf to the Swahili Coast; the scale of trade continued to expand through the mid-12th century.
2. 1143–1148Kilwa · TanzaniaKilwa Island became an important trade and minting center, controlling some ports of the southern Swahili Coast; city-states such as Mombasa and Malindi also participated in ivory and gold exports, with their sultans accumulating wealth through customs duties and trade monopolies.
3. 1147–1150Swahili Coast · East AfricaCoastal city-states obtained gold and ivory deep in the interior through Bantu-speaking merchants; mosques and stone buildings were erected in port cities, and the Swahili language and Islamic culture spread among the trading elite, forming a composite civilization belt linking the Zambezi River basin with the Indian Ocean.