* Mombasa, Kenya: This major port city has been a vital hub for trade since ancient times. Its strategic location on the Indian Ocean made it a critical point for the exchange of goods between East Africa, the Middle East, India, and Europe.
* Zanzibar, Tanzania: This island off the coast of Tanzania was a major center for the spice trade and had significant connections to Arabia and the Indian subcontinent. Its history is closely linked to the development of the Swahili language and culture.
* Kilwa Kisiwani, Tanzania: This archaeological site, located on an island off the coast of Tanzania, was a major trading center during the Middle Ages. Kilwa was known for its wealth, derived from the export of gold, ivory, and slaves.
* Lamu, Kenya: This historic town, known for its traditional Swahili architecture, was a vital port for trade between the interior of Africa and the Indian Ocean. It played a significant role in the spread of Islam and the development of Swahili culture.
The specific city you're looking for might depend on the specific period of history you're interested in. For example, Kilwa Kisiwani flourished in the 13th and 14th centuries, while Zanzibar reached its peak of power in the 19th century.
To help me pinpoint the exact city you're looking for, could you provide some more details about the time period or specific trade goods you're interested in?