A brief History - During the Middle Ages, Zanzibar and other settlements on the Swahili Coast were advanced. The littoral contained a number of autonomous trade cities. These towns grew in wealth as the Bantu Swahili people served as intermediaries and facilitators to local, Arab, Persian, Indonesian, Malaysian, Indian, and Chinese merchants. This interaction contributed in part to the evolution of the Swahili culture, which developed its own written language. Although a Bantu language, Swahili as a consequence today includes some elements that were borrowed from other civilizations, particularly Arabic. With the wealth that they had acquired through trade, some of the Arab traders also became rulers of the coastal cities Vasco da Gama's visit in 1498 marked the beginning of European influence. In 1503 or 1504, Zanzibar became part of the Portuguese Empire when Captain Ruy Lourenço Ravasco Marques landed and demanded and received tribute from the sultan in exchange for peace. Zanzibar remained a possession of Portugal for almost two centuries. It initially became part of the Portuguese province of Arabia and Ethiopia and was administered by a governor general. Around 1571, Zanzibar became part of the western division of the Portuguese empire and was administered from Mozambique. It appears, however, that the Portuguese did not closely administer Zanzibar. The first English ship to visit Unguja, the Edward Bonaventure in 1591, found that there was no Portuguese fort or garrison. The extent of their occupation was a trade depot where produce was purchased and collected for shipment to Mozambique. "In other respects, the affairs of the island were managed by the local 'king', the predecessor of the Mwinyi Mkuu of Dunga." This hands-off approach ended when Portugal established a fort on Pemba around 1635 in response to the Sultan of Mombasa's slaughter of Portuguese residents several years earlier. The precise origins of the sultans of Unguja are uncertain. However, their capital at Unguja Kuu probably is believed to have been an extensive town, possibly constructed by locals. Although there were Arabs in Zanzibar and the remainder of the Swahili Coast both before and after the Portuguese, the political situation was far different. The older settlements prior to the arrival of the Portuguese are quite distinct from the later lordship of Oman and Maskat. When the Portuguese arrived in 1498 they found on the coast a series of independent towns, peopled by Arabs, but not united to Arabia by any political tie. Their relations with these Arabs were mostly hostile, but during the sixteenth century they firmly established their power, and ruled with the aid of tributary Arab sultans. This system lasted till 1631, when the Sultan of Mombasa massacred the European inhabitants. In the remainder of their rule, the Portuguese appointed European governors, who were apparently most distasteful to the natives, who invited the Arabs of Oman, who now appear on the scene for the first time, to assist them in driving the foreigners out. In 1698, Zanzibar fell under the control of the Sultanate of Oman. Until around 1890, the sultans of Zanzibar controlled a substantial portion of the Swahili Coast, known as Zanj, which included Mombasa and Dar es Salaam. Beginning in 1886, Great Britain and Germany plotted to obtain parts of the Zanzibar sultanate for their own empires. In October 1886, a British-German border commission established the Zanj as a 10 nautical mile (19 km) wide strip along most of the region's coast, an area stretching from Cape Delgado (now in Mozambique) to Kipini (now in Kenya),including Mombasa and Dar es Salaam. Over the next few years, however, almost all of these mainland possessions were lost to European imperial powers. The sultans developed an economy of trade and cash crops in the Zanzibar Archipelago with a ruling Arab elite. Ivory was a major trade good. The archipelago, also known as the Spice Islands, was famous worldwide for its cloves and other spices, and plantations were developed to grow them. The archipelago's commerce gradually fell into the hands of traders from the Indian subcontinent, whom Said bin Sultan encouraged to settle on the islands. During his 14-year reign as sultan, Majid bin Said consolidated his power around the local slave trade. Malindi in Zanzibar City was the Swahili Coast's main port for the slave trade with the Middle East. In the mid-19th century, as many as 50,000 slaves passed annually through the port. Many were captives of Tippu Tib, a notorious Arab slave trader and ivory merchant. Tib led huge expeditions, some 4,000 strong, into the African interior, where chiefs sold him their villagers for next to nothing. These Tib used to caravan ivory back to Zanzibar, then sold them in the slave market for large profits. In time Tib became one of the wealthiest men in Zanzibar, the owner of multiple plantations and 10,000 slaves One of Majid's brothers, Barghash bin Said, succeeded him and helped abolish the slave trade in the Zanzibar Archipelago and largely developed Unguja's infrastructure. Another brother of Majid, Khalifa bin Said, was the third sultan of Zanzibar and furthered the archipelago's progress toward abolishing slavery. British protectorate Monument to the slaves in Zanzibar Control of Zanzibar eventually came into the hands of the British Empire; part of the political impetus for this was the 19th century movement for the abolition of the slave trade. Zanzibar was the center of the Arab slave trade, and In 1822, the British counsel in Muscat put pressure on Sultan Said to end the slave trade. The first of a series of anti-slavery treaties with Britain was signed by Said which prohibited slave transport south and east of the Moresby Line, from Cape Delgado in Africa to Diu Head on the coast of India. Said lost the revenue he would have received as duty on all slaves sold, so to make up for this shortfall he encouraged the development of the slave trade in Zanzibar itself. Said came under increasing pressure from the British to abolish slavery, and in 1842 the British government told the Zanzibari ruler it wished to abolish the slave trade to Arabia, Oman, Persia and the Red Sea. Ships from the Royal Navy were employed to enforce the anti-slavery treaties by capturing any dhows carrying slaves, but with only four ships patrolling a huge area of sea, the British navy found it hard to enforce the treaties as ships from France, Germany, Spain, Portugal and the United States continued to carry slaves. In 1856 Sultan Majid consolidated his power around the African Great Lakes slave trade, and in 1873 Sir John Kirk informed his successor, Sultan Barghash, that a total blockade of Zanzibar was imminent, and Barghash reluctantly signed the Anglo-Zanzibari treaty which abolished the slave trade in the sultan's territories, the closing of all slave markets and the protection of liberated slaves. The relationship between Britain and the German Empire, at that time the nearest relevant colonial power, was formalized by the 1890 Heligoland-Zanzibar Treaty, in which Germany agreed to "recognize the British protectorate over ... the islands of Zanzibar and Pemba". That year, Zanzibar became a protectorate (not a colony) of Britain. From 1890 to 1913, traditional viziers were appointed to govern as puppets, switching to a system of British residents (effectively governors) from 1913 to 1963. The death of the pro-British Sultan Hamad bin Thuwaini on 25 August 1896 and the succession of Sultan Khalid bin Barghash, who the British did not approve, led to the Anglo-Zanzibar War. On the morning of 27 August 1896, ships of the Royal Navy destroyed the Beit al Hukum Palace. A cease fire was declared 38 minutes later, and to this day the bombardment stands as the shortest war in history. Independence and subsequent merger with Tanganyika The Old Fort of Zanzibar and part of the Stone town The islands gained independence from Great Britain on 10 December 1963 as a constitutional monarchy. A month later, the bloody Zanzibar Revolution, in which hundreds to 20,000 of Arabs and Indians were killed in a genocide and thousands more expelled, led to the establishment of the People's Republic of Zanzibar and Pemba. In April 1964, the republic merged with mainland Tanganyika. This United Republic of Tanganyika and Zanzibar was soon renamed (as a portmanteau) the United Republic of Tanzania, of which Zanzibar remains a semi-autonomous region. --A brief history. --- extract from Wikipedia.