Kilwa was one of the principal Muslim ports of the East African coast. During the thirteenth century, Mogadishu remained the more important town, with Merca and Brava associated with it, and Kilwa’s trade was probably directed primarily toward Mogadishu. This balance changed when Kilwa’s rulers gained greater control over the gold trade and redirected commercial connections toward Sofala and Aden.

The rise of the Mahdali dynasty transformed Kilwa’s political position. Al-Hasan b. Talut displaced the previous “Shirazi” ruler with support from an anti-Mafia faction among Kilwa’s inhabitants. Under his grandson al-Hasan b. Sulayman, Mafia was defeated, and the connection with Mogadishu was severed or substantially reduced. Kilwa could then channel more of its commerce directly to Aden while relatives of its rulers controlled the Sofala region.

Kilwa’s prosperity was visible in its architecture. Stone building increased markedly in the early fourteenth century, with vaults and domes becoming part of a new style. The Great Mosque was enlarged to more than twice its earlier area, while Husuni Kubwa combined the functions of palace and emporium. The complex contained extensive store-rooms around a large courtyard and may have housed the offices of a commercial factor.

The city’s architecture was distinctive to the East African coast, even though Husuni Kubwa and nearby Husuni Ndogo show affinities with earlier Umayyad and Abbasid buildings in the Islamic heartlands. Houses were generally built from coral stone and lime mortar, arranged closely along narrow lanes. Courtyards, reception rooms, verandahs and living quarters formed a recurring plan, while mosques, tombs and carved coral decoration gave the city a recognizable architectural character.

Kilwa’s maritime economy depended on networks extending along the coast and across the western Indian Ocean. Chinese wares became more common during the fourteenth-century prosperity, while Aden pottery and connections with southwestern Arabia remained significant. Gold arriving from Sofala was taxed at Kilwa, and merchants could also be charged when they proceeded to Mombasa, indicating the reach of Kilwa’s commercial authority.

Kilwa’s fortunes weakened during the latter part of the fourteenth century, when construction slowed and coin minting ceased. Building activity revived on Songo Mnara in the first half of the fifteenth century, but succession disputes increasingly allowed Zanzibar’s ruling family to intervene. Intrigues among amirs and viziers further reduced the sultan’s authority and weakened Kilwa’s hold over southern territories and trade.

By the arrival of the Portuguese, the governor of Sofala had effectively declared himself independent. Kilwa’s authority over Angoche and other towns north of Sofala may also have suffered, although the excerpt questions whether those settlements had ever been subject to Kilwa. Despite this decline, Kilwa remained a key reference point in the history of Swahili urbanism, Islamic life and western Indian Ocean exchange.