An outline, era by era

Swahili Coast city-states

Medieval / Post-Classical Era · ~500 – ~1500 CE

The Swahili Coast is the strip of East African shoreline and offshore islands running from southern Somalia through Kenya and Tanzania to northern Mozambique. From about the 8th century CE, farming and fishing communities there grew into stone-built port towns such as Shanga, Kilwa, Mombasa, Gedi, Lamu and Zanzibar's Unguja Ukuu. Each town was its own small state, ruled by a local elite and usually without a single overarching ruler.

The people spoke Swahili, a Bantu language with many Arabic loanwords, and by the 11th to 14th centuries most coastal elites were Muslim. The towns traded ivory, gold from the interior, timber and slaves for Indian cloth and beads, Chinese porcelain and Middle Eastern glass. Their culture was African in origin and shaped by the Indian Ocean world. The cities flourished until the Portuguese arrived after 1498 and disrupted their trade.

Things happened, and the rest is history

  1. Early Indian Ocean trade at Unguja Ukuu and Shanga

    Event

    What happened

    From about the 7th to 8th centuries CE, settlements on the East African coast and islands take part in Indian Ocean trade. At Unguja Ukuu on Zanzibar, excavations find imported Near Eastern pottery and glass beads. At Shanga, near Lamu, a timber mosque is built around the 8th century and later rebuilt in stone.

    The rest is history

    These sites show that coastal communities were already linked to Red Sea, Gulf and Indian markets well before the stone towns of the later Middle Ages. Archaeologists generally see the Swahili culture as growing out of local African societies, with outside contacts adding to it. Later trade would bring wealth that paid for the stone architecture. Horton's excavations at Shanga, published in 1996, give a continuous sequence from about 760 CE.

    Sources

    1. BookHorton, Mark. Shanga: The Archaeology of a Muslim Trading Community on the Coast of East Africa. London: British Institute in Eastern Africa, 1996.
    2. BookHorton, Mark, and John Middleton. The Swahili: The Social Landscape of a Mercantile Society. Oxford: Blackwell, 2000.

  2. The Periplus of the Erythraean Sea and early Azania

    Event

    What happened

    A Greek merchant's guide written in the 1st century CE describes sailing south from the Red Sea along the coast called Azania. It names the trading port Rhapta and lists ivory, tortoiseshell and rhinoceros horn as exports. It says the area is under the authority of Arab rulers from Mapharitis.

    The rest is history

    The Periplus is the earliest written evidence for coastal East Africa's commercial ties with the wider Indian Ocean. The location of Rhapta has never been confirmed. The text shows that the monsoon trade pattern existed centuries before the Swahili towns. Later Arab geographers such as al-Masudi, writing around 940 CE, add detail on the coast and its people, called the Zanj.

    Sources

    1. PrimaryPeriplus Maris Erythraei (Periplus of the Erythraean Sea). Greek merchant's guide, 1st century CE. Translated by Lionel Casson, Princeton: Princeton University Press, 1989.Sections 15 to 18 describe Azania and Rhapta.
    2. BookCasson, Lionel. The Periplus Maris Erythraei. Princeton: Princeton University Press, 1989.

  3. Islam arrives on the coast

    Event

    What happened

    Between the 8th and 14th centuries, Islam spreads among coastal communities through trade contacts with Arabia and the Persian Gulf. Early mosques appear at Shanga and other sites, and by the 14th century the traveller Ibn Battuta finds devout Muslim rulers and scholars in Mogadishu, Mombasa and Kilwa.

    The rest is history

    Conversion was gradual and mostly peaceful, and it ran alongside local African customs. Muslim identity linked the elites to merchants across the ocean and gave them shared law and literacy. Stone mosques and tombs became symbols of urban status. The Kilwa Chronicle and Ibn Battuta's account of 1331 are key written sources.

    Sources

    1. PrimaryIbn Battuta. Rihla (Travels). Arabic travel account, c. 1355. Translated by H. A. R. Gibb, The Travels of Ibn Battuta, vol. 2, Cambridge: Hakluyt Society, 1962.
    2. BookPouwels, Randall L. Horn and Crescent: Cultural Change and Traditional Islam on the East African Coast, 800-1900. Cambridge: Cambridge University Press, 1987.

  4. Kilwa and the gold trade

    Event

    What happened

    From about the 12th to 13th centuries, Kilwa on a small island in present-day Tanzania gains control of the gold trade from Sofala, in Mozambique, which supplies gold from the Zimbabwe plateau. Its rulers build the Husuni Kubwa palace and a large mosque, and mint their own copper coins. Ibn Battuta visits around 1331 and praises the sultan's generosity.

    The rest is history

    Kilwa became the richest Swahili town of the 14th century. Its coins, found as far away as Great Zimbabwe, show its reach. The city's wealth drew Portuguese attention. In 1505 a Portuguese fleet under Francisco de Almeida attacked and took Kilwa, and the gold trade passed into Portuguese hands. The ruins are a UNESCO World Heritage site.

    Sources

    1. PrimaryKilwa Chronicle. Arabic and Portuguese versions, 16th century. Translated in G. S. P. Freeman-Grenville, The East African Coast: Select Documents, Oxford: Clarendon Press, 1962.
    2. BookSutton, John. A Thousand Years of East Africa. Nairobi: British Institute in Eastern Africa, 1990.

  5. Stone towns and the coral-built townscape

    Event

    What happened

    From about the 13th to 15th centuries, wealthy families in towns such as Gedi, Kilwa, Songo Mnara and Lamu build houses, mosques and tombs of coral stone and lime. Houses have carved doors, niches and enclosed courtyards. Pillar tombs mark the graves of notable people.

    The rest is history

    This architecture marks a distinct urban Swahili identity, and its forms were adapted over time. Archaeology at Songo Mnara and Gedi shows planned towns with neighbourhoods and shared mosques. The towns also imported Chinese celadon and blue-and-white porcelain, evidence of far-reaching trade. Many ruins were abandoned after the 16th and 17th centuries.

    Sources

    1. BookGarlake, Peter. The Early Islamic Architecture of the East African Coast. Nairobi: British Institute in Eastern Africa, 1966.
    2. BookFleisher, Jeffrey, and Stephanie Wynne-Jones. Archaeology of the Swahili Coast. Oxford: Oxford University Press, forthcoming.Omit if unavailable.

  6. Zheng He's voyages reach East Africa

    Event

    What happened

    Between 1405 and 1433, Ming China sends seven large fleets under Admiral Zheng He into the Indian Ocean. Later voyages reach the East African coast, including Mogadishu and Malindi. Envoys and gifts, including giraffes, are exchanged with coastal rulers.

    The rest is history

    The voyages show that East African ports were known in China and part of a networked Indian Ocean. The Ming ended the expeditions after 1433, and there was no lasting Chinese presence. Chinese ceramics found on Swahili sites span a longer period of trade, largely carried by other merchants. The giraffe presented in 1414 is recorded in Chinese sources.

    Sources

    1. PrimaryMing Shi (History of the Ming). Chinese official history, compiled 1739, with accounts of Zheng He's voyages.
    2. BookDreyer, Edward L. Zheng He: China and the Oceans in the Early Ming Dynasty, 1405-1433. New York: Pearson Longman, 2007.

  7. Vasco da Gama and the Portuguese arrival

    Event

    What happened

    In 1498 Vasco da Gama's fleet sails up the East African coast on its way to India. It is received at Malindi and Mombasa with mixed welcomes, and a Malindi pilot guides it across to India. In the following years the Portuguese attack and take Kilwa and Mombasa.

    The rest is history

    The Portuguese sought to control the gold and spice routes. They built Fort Jesus at Mombasa in 1593 to 1596. Their hold was uneven and costly, and Omani forces took Fort Jesus in 1698. The Swahili towns survived but with reduced independence and trade.

    Sources

    1. PrimaryÁlvaro Velho. Roteiro da primeira viagem de Vasco da Gama (Journal of the First Voyage of Vasco da Gama). Portuguese account, c. 1500.
    2. BookSubrahmanyam, Sanjay. The Career and Legend of Vasco da Gama. Cambridge: Cambridge University Press, 1997.

  8. The Shirazi founding of Kilwa

    Origin story

    The legend

    In the Kilwa Chronicle, a sultan of Shiraz in Persia sails with his six sons to East Africa. He buys the island of Kilwa from a local African ruler and founds a dynasty there. Other coastal towns tell similar stories of Shirazi ancestors.

    The rest is history

    The chronicle was written in the 16th century, centuries after the supposed events. Archaeology shows Kilwa grew from a local African settlement, with no evidence of a Persian migration. Scholars see the Shirazi tradition as a way for coastal elites to claim prestigious Islamic and Persian ancestry. Some Persian Gulf contacts were real, though. Chittick's excavations at Kilwa in the 1960s showed continuous local development from about the 9th century.

    Sources

    1. PrimaryKilwa Chronicle. Arabic and Portuguese versions, 16th century. In Freeman-Grenville, The East African Coast: Select Documents, Oxford: Clarendon Press, 1962.
    2. BookChittick, H. Neville. Kilwa: An Islamic Trading City on the East African Coast. Nairobi: British Institute in Eastern Africa, 1974.

  9. Swahili as an Arab creation

    Popular belief

    The legend

    A common belief holds that the Swahili towns were founded by Arab or Persian settlers, and that Swahili culture is a foreign import brought to Africa.

    The rest is history

    This idea grew in colonial-era writing, which tended to credit outsiders for African achievements. Linguists show that Swahili is a Bantu language, with Arabic borrowings added over centuries. Archaeology shows local African foundations at sites such as Shanga and Kilwa. Foreign merchants did settle and intermarry, so the culture is a blend, but its roots are African. Nurse and Spear's 1985 study sets out the linguistic and historical evidence.

    Sources

    1. BookNurse, Derek, and Thomas Spear. The Swahili: Reconstructing the History and Language of an African Society, 800-1500. Philadelphia: University of Pennsylvania Press, 1985.
    2. BookHorton, Mark, and John Middleton. The Swahili: The Social Landscape of a Mercantile Society. Oxford: Blackwell, 2000.

← Back to the outline