The Kilwa Sultanate was a sultanate, centered at Kilwa (an island off modern-day, Kilwa District in Lindi Region of Tanzania), whose authority, at its height, stretched over the entire length of the Swahili Coast. According to the legend, it was founded in the 10th century by Ali ibn al-Hassan Shirazi, a Persian prince of Shiraz.
History
The history of the Kilwa Sultanate begins around 960–1000 AD. According to legend, Ali ibn al-Hassan Shirazi was one of seven sons of a ruler of Shiraz, Persia, his mother an Abyssinian slave. Upon his father's death, Ali was driven out of his inheritance by his brothers. Setting sail out of Hormuz, Ali ibn al-Hassan, his household and a small group of followers first made their way to Mogadishu, the main commercial city of the East African coast. However, Ali failed to get along with the city's Somali elite and he was soon driven out of that city as well.
Steering down the African coast, Ali is said to have purchased the island of Kilwa from the local Bantu inhabitants. According to one chronicle (Strong (1895)), Kilwa was originally owned by a mainland Bantu king 'Almuli' and connected by a small land bridge to the mainland that appeared in low tide. The king agreed to sell it to Ali ibn al-Hassan for as much colored cloth as could cover the circumference of the island. But when the king later changed his mind, and tried to take it back, the Persians had dug up the land bridge, and Kilwa was now an island.
A genetic study, published on March 29, 2023, confirmed the presence of significant Iranian-origin ancestry in the Y-chromosomal DNA of medieval inhabitants of the Swahili Coast, strongly supporting elements of the Persian-admixture narrative.
Kilwa's fortuitous position made it a much better East African trade center than Mogadishu. It quickly began to attract many merchants and immigrants from further north, including Persia and Arabia. In just a few years, the city was big enough to establish a satellite settlement at nearby Mafia Island.
Kilwa's emergence as a commercial center challenged the dominance once held by Mogadishu over the East African coast. Suleiman Hassan, the ninth successor of Ali (and 12th ruler of Kilwa, c. 1178–1195), wrested control of the southerly city of Sofala from the Mogadishans. Wealthy Sofala was the principal entrepot for the gold and ivory trade with Great Zimbabwe and Monomatapa in the interior. The acquisition of Sofala brought a windfall of gold revenues to the Kilwa Sultans, which allowed them to finance their expansion and extend their powers all along the East African coast.
At the end of the 13th century Kilwa came under the control of the Mahdali dynasty of Yemeni Arab origin, which built the Husuni Kubwa palace in the 14th century.
At the zenith of its power in the 15th century, the Kilwa Sultanate owned or claimed overlordship over the mainland cities of Malindi, Lamu, Inhambane, and Sofala and the island-states of Mombasa, Pemba, Zanzibar, Mafia, Comoro, and Mozambique (plus numerous smaller places) – essentially what is now often referred to as the "Swahili Coast".
Kilwa also claimed lordship across the channel over the myriad of small trading posts scattered on the coast of Madagascar (then known by its Arabic name of Island of the Moon). To the north, Kilwa's power was checked by the independent Somali city-state of Mogadishu (the once-dominant city, Kilwa's main rival) and the Adal Sultanate (the Muslim Sultanate located in the Horn of Africa). To the south, Kilwa's reach extended as far as Cape Correntes, below which merchant ships did not usually dare sail.
While a single figure, the Sultan of Kilwa, stood at the top of the hierarchy, the Kilwa Sultanate was not a centralized state. It was more a confederation of commercial cities, each with its own internal elite, merchant communities and trade connections. The Sultan might appoint a governor or overseer, but even his authority was not consistent – in some places (e.g. outposts like Mozambique Island) he was a true governor in the Sultan's name, whereas in more established cities like Sofala, his powers were much more limited, more akin to an ambassador to the city than its governor.
Society and economy
Despite its origin as a Persian colony, extensive inter-marriage and conversion of local Bantu inhabitants and later Arab immigration turned the Kilwa Sultanate into a veritable melting pot, ethnically indifferentiable from the mainland. Recent ancient DNA studies have confirmed that Asian ancestry in the medieval period originally came from Iran, and that Asian and African ancestors began mixing at least 1,000 years ago.
The mixture of Perso-Arab and Bantu cultures is credited for creating a distinctive East African culture and language known today as Swahili (literally, 'coast-dwellers'). Nonetheless, the Muslims of Kilwa (whatever their ethnicity) would often refer to themselves generally as Shirazi or Arabs, and to the unconverted Bantu peoples of the mainland as Zanj or Kuffar ('infidels').
The Kilwa Sultanate was almost wholly dependent on external commerce. Effectively, it was a confederation of urban settlements, with trade being the backbone of its economy. While there was some local agriculture, the sultanate relied heavily on trade to sustain its urban populations. Grains (principally millet and rice), meats (cattle, poultry), and other necessary supplies had to be purchased from the Bantu tribes of the interior. Kilwan traders encouraged the development of market towns in the Bantu-dominated highlands of what are now Kenya, Tanzania, Mozambique, and Zimbabwe, where agricultural commodities such as grain and meat were exchanged for luxury goods and raw materials like gold and ivory.
The Kilwan mode of living was that of middlemen traders, who imported manufactured goods (like cloth and spices) from Arabia, India, and Persia, and exchanged them in the interior for agricultural products and precious raw materials, like gold and ivory. These were then exported to other parts of the Indian Ocean world, including Arabia, Persia, India, and even China. Kilwa’s economy also saw significant involvement in the slave trade, with the majority of slaves coming from the Bantu peoples of the interior, as well as from the highland regions of East Africa and occasionally from other groups from the Horn of Africa. Slaves were often captured in raids or conflicts and sold to markets in the Arabian Peninsula, Persia, and India.
A notable exception to Kilwa's reliance on external trade was the coconut palm tree. Grown all along the coast, the coconut palm was the mainstay of Kilwan life in every way – not only for its fruit, but also for timber, thatching, and weaving. Kilwan merchant ships – from the large lateen-rigged dhows that plied the open oceans to the small zambucs used for local transit – were usually built from the split trunks of coconut palm wood, their sails made from coconut leaf matting, and the ships held together by coconut coir.
Kilwa Sultanate conducted extensive trade with Arabia, Persia, and across the Indian Ocean to India itself. Coins from the Kilwa Sultanate have been found as far as the Wessel Islands in Australia, which was inhabited by the Yolngu at that time. Kilwan ships made use of the seasonal monsoon winds to sail across to India in the summer and back to Africa in the winter. Kilwan pilots were renowned for their extraordinary sailing accuracy, and Portuguese sailors marveled at their navigational instruments, particularly their latitude staves, which they considered superior to their own.
Nonetheless, the coir-sewn Kilwan ships were not seaworthy enough to brave the treacherous waters and unpredictable violent gusts around Cape Correntes, so the entire region south of that point was rarely sailed by Kilwan merchants. Inhambane was the most southerly settlement that can be considered part of the Kilwan trading empire.
Decline and fall
In its later years, the Sultans of Kilwa began falling into the hands of their ambitious ministers (viziers and emirs), who played the roles of kingmakers, and de facto rulers, and occasionally tried to foist themselves (or one of their family members) on the throne, in competition with the royal dynasty. The most successful was probably Emir Muhammad Kiwabi, who ruled Kilwa for nearly two decades through several sultans, including himself at one point.
Throughout his long 'reign', Emir Muhammad fought an on-again and off-again battle with his nephew, Hassan ibn Suleiman (son of an earlier vizier). Muhammad had, in fact, tried to install Hassan as sultan a couple of times, but it met tremendous resistance from the population of Kilwa. Eventually, Emir Muhammad decided that, in the interests of constitutional propriety and civic peace, Kilwa sultans should always come from the royal dynasty, not families of viziers. Muhammad held that line more or less down to the end, thwarting Hassan's ambitions.
The last sultan installed by Emir Muhammad before his death was the royal prince al-Fudail ibn Suleiman in 1495. The man who succeeded to Muhammad's post, Emir Ibrahim (known as Mir Habrahemo in Barros, Abraemo in Goes), helped al-Fudail crush the ambitious Hassan once and for all in a great battle outside Kilwa. But it was not long after this battle that Emir Ibrahim is said to have betrayed and murdered sultan al-Fudail. Rather than declare himself sultan, Ibrahim took power merely with the title of emir, and claimed to be exercising rule in the name of a son of an earlier sultan Suleiman (ibn Muhammad?) of the old royal dynasty. That no one had seen or heard of this absent prince for years was quite convenient for Emir Ibrahim. Emir Ibrahim's usurpation was met with shock not only in Kilwa, but in the vassal cities as well. Emir Muhammad had (belatedly) recognized the importance of constitutional propriety for peace in the Kilwa Sultanate. Emir Ibrahim's murderous coup had run roughshod over it. Most of the local governors of the Kilwa vassal cities, many who were either relatives or had owed their positions to Emir Muhammad and the royal dynasty, refused to acknowledge the usurpation of Emir Ibrahim, and began charting an independent course for their own city-states. The writ of Emir Ibrahim probably only covered the city of Kilwa itself and possibly Mozambique Island.
This was more or less the condition of the Kilwa Sultanate when the Portuguese arrived.
Portuguese era
Source:
Portuguese scout Pêro da Covilhã, disguised as an Arab merchant, had travelled the length of the Kilwa Sultanate in 1489–1490, and visited the ports of Malindi, Kilwa and Sofala, and delivered his scouting report back to Lisbon, describing the condition of the Kilwa Sultanate in quite some detail. The first Portuguese ships, under Vasco da Gama, on their way to India, reached the sultanate in 1497. Da Gama made contact with the Kilwa vassals of Mozambique, Mombassa, and Malindi, seeking to secure their cooperation as staging posts for the Portuguese India Armadas.
In 1500, the 2nd Portuguese India Armada, under Pedro Álvares Cabral, visited Kilwa itself, and attempted to negotiate a commercial and alliance treaty with Emir Ibrahim. But emir prevaricated and no agreement was reached.
The well-armed Fourth Armada of 1502, under Vasco da Gama again, came in a more mean-spirited mood, indisposed to take no for an answer. Having secured separate treaties with Malindi, Mozambique and all-important Sofala, the Portuguese brought their menacing fleet to bear on Kilwa itself, and extorted a sizeable tribute from Emir Ibrahim.
Some have speculated whether Emir Ibrahim missed a golden opportunity to restore his fortunes, that had a treaty with Cabral been reached back in 1500, he might have secured the assistance of the Portuguese navy in bringing the half-independent vassals back under his sway. At least one Kilwan nobleman, a certain Muhammad ibn Rukn ad Din (known to the Portuguese as Muhammad Arcone), certainly advised Emir Ibrahim to strike up an alliance with the Portuguese (and for his pains, was given up as a hostage to the Portuguese by the Emir, who then refused ransom him back – allowing him to be subjected to da Gama's wrath).