Swahili Coastal City-State Trade Network

Timeline

1. 1000–1200Somalia–Kenya coast · Indian Ocean coastBantu farmers and herders, along with Arab and Persian merchants, established trading settlements along the monsoon routes on the coast; Swahili language and Islamic faith gradually merged, forming primary trade nodes linking inland gold-producing regions with the Indian Ocean.
2. 1200–1300Kilwa Kisiwani · TanzaniaThe Kilwa Sultanate controlled many ports of the southern Swahili Coast, maintaining the chain of city-states through tariffs, coinage, and suzerainty; traded goods included gold, ivory, ambergris, and porcelain and textiles from across the Indian Ocean.
3. 1390–1400Mombasa · KenyaCity-states such as Mombasa, Malindi, and Kilwa were active in trade, with resident Arab, Persian, and Gujarati merchants and abundant Chinese porcelain remains; travelers such as Ibn Battuta recorded coastal prosperity, and the network was at its peak before the Portuguese advance eastward.
4. 1500–1800Swahili Coast · Indian Ocean coastPortuguese navies controlled key ports and levied trade taxes; the Omani Sultanate later expelled the Portuguese and established Zanzibar hegemony. Traditional city-state politics declined, but Swahili merchant communities and Indian Ocean commercial ties continued in new forms.