Zanzibar's stone houses were a homegrown African invention, not an Arab import
Zanzibar's merchant houses of coral and lime are often credited to Arab or Persian settlers. Historians including Mark Horton argue they grew entirely out of local building traditions, rising from timber huts around 1050 to lime-bonded stone by the 1300s, as the Spice Islands became a hub of Swahili trade.
Zanzibar is a semi-autonomous Tanzanian region made up of two large islands, Unguja and Pemba, plus many small ones. Its capital, Zanzibar City, sits on Unguja, and the old quarter of Stone Town is a UNESCO World Heritage Site. Once a sovereign state, it joined Tanganyika in 1964 to create Tanzania. Cloves, nutmeg, cinnamon and black pepper earned the archipelago its nickname, the Spice Islands, and tourism has boomed, from 19,000 visitors in 1985 to 917,000 in 2025. The name traces through Arabic to a Persian compound meaning black coast.
Stone microliths show people here for at least 20,000 years. A Greco-Roman sailing guide written between the 1st and 3rd centuries mentions an island called Menuthias, probably Unguja. Bantu speakers settled the islands early in the first millennium, and at Fukuchani on the northwest coast a farming and fishing village with timber houses, shell beads and iron slag existed by the 6th century, though imported pottery makes up under 1% of finds.
Trade took off from the mid-8th century, and by the end of the 10th Zanzibar ranked among the leading Swahili towns. Swahili brokers bought gold, ivory and ambergris from the interior for Persian, Indian and Arab buyers, and inland caravans came for Indian cloth. Monsoon winds kept Asian traders ashore for up to six months, and many married into local families. Excavations on Pemba and elsewhere trace homes moving from timber around 1050 to mud and coral about 1150, stone by the 13th century and lime mortar in the 14th, though most people still lived in thatched single-storey houses.
Vasco da Gama's 1498 visit opened the European era, and by 1503 or 1504 a Portuguese captain was collecting tribute. Portuguese control lasted nearly two centuries but was loose: the English ship Edward Bonaventure found no fort in 1591. Today the islands shelter the endemic Zanzibar red colobus and servaline genet, while tourism, fishing and rising seas put growing strain on reefs that nurse Indian Ocean fish.
Source: Zanzibar
