Swahili merchants formed part of a commercial system that extended across the Indian Ocean between East Africa, the Middle East, and Asia. Moving south from the port city of Kilwa, they were attracted to Mozambique by the region’s gold and ivory. By the middle of the fifteenth century, they had established a chain of permanent commercial and religious sultanates along the coast.

These coastal settlements stretched between the islands of Angoche and Mozambique in the far north and Sofala in the south. Sofala was especially important because it provided access to the inland gold mines and markets associated with the Kingdom of Muenemutapa. The enclaves therefore connected maritime commerce with inland political economies and helped incorporate Mozambique into a wider world economy.

Swahili traders living in the sultanates often married local women. Over time, their descendants developed a distinctive ethnic and cultural identity and became known as Swahili, as elsewhere along the East African coast. Commercial exchange was unequal: gold and ivory were exchanged for imported goods whose value, within local societies, did not match the value assigned to the exports by merchant capitalists.

Portuguese expansion into the Indian Ocean around 1500 directly challenged Swahili commercial hegemony. Seeking strategic ports and access to gold and ivory, Portuguese forces had taken control of Sofala, established a settlement on Mozambique Island, and occupied Angoche by 1525. These interventions disrupted the Swahili trading network and opened a prolonged contest over Mozambique’s coastal and inland commerce.