Swahili Coast Trade

Timeline

1. 1035–1038Kilwa · TanzaniaPorts such as Kilwa, with deep-water bays and coral-stone architecture, became regional trade centers. Local chiefs and foreign merchants jointly built mosques and warehouses; port tariffs and mooring fees constituted town revenues, and coral-stone houses and mosques marked the maturity of Swahili civilization.
2. 1038–1039Mombasa · KenyaArab and Persian merchant ships used the southwest monsoon to reach the East African coast, trading cotton cloth, porcelain, and glass beads for ivory and gold. Ships continued south to Sofala and north to the mouth of the Red Sea and India's west coast, forming regular routes covering the Indian Ocean; Mombasa and Malindi became midway supply ports.
3. 1039–1040Swahili Coast · Swahili CoastCoastal town elites broadly converted to Islam; Swahili, on a Bantu base, absorbed many Arabic loanwords and became the common language of trade. Islamic law and local customary law ran in parallel, and town traditions of self-governance coexisted with foreign merchant communities, laying the distinctive character of medieval East African commercial civilization.