Trade routes that led from the heart of the continent to the East African coast gradually gave rise to Swahili culture a blend of Arab, Indian and Bantu influences that created one of the most developed trade networks in the Indian Ocean.
Although archaeological evidence shows the area was used as a trading port for Greek and Persian ships as early as 400 BC, permanent coastal settlements only developed around 800 AD, when civilizations around the Indian Ocean were wealthy enough to support annual voyages and a high volume of trade.
With large caravans laden with gold, spices, ivory, and slaves departing from Zanzibar, Kilwa, and other less prominent East African ports, Swahili civilization grew and flourished until the 15th century, when trade became more confined to Mombasa and Zanzibar.
