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The Isle of Man (Manx: Mannin, also Ellan Vannin) or Mann (/ m æ n / man), is a self-governing British Crown Dependency in the Irish Sea, between Great Britain and Ireland. It is recognised as one of the Celtic nations and is the homeland of the Manx people, a Celtic ethnic group. As head of state, Charles III holds the title Lord of Mann and is represented by a Lieutenant Governor. The government of the United Kingdom is responsible for the Isle of Man's military defence and represents it abroad, but the Isle of Man still has a separate international identity.

Humans have lived on the island since before 6500 BC. Gaelic cultural influence began in the 5th century AD, when Irish missionaries following the teaching of St. Patrick began settling the island, and the Manx language, a branch of the Goidelic languages, emerged. In 627, King Edwin of Northumbria conquered the Isle of Man along with most of Mercia. In the 9th century, Norsemen established the thalassocratic Kingdom of the Isles, which included the Isle of Man. Magnus III, King of Norway from 1093 to 1103, reigned as King of Man and the Isles between 1099 and 1103.

In 1266, King Magnus VI of Norway sold his suzerainty over Man to King Alexander III of Scotland under the Treaty of Perth. After a period of alternating rule by the Kings of Scotland and England, the island came under the feudal lordship of the English Crown in 1399. The lordship revested in the British Crown in 1765, but the island did not become part of the 18th-century Kingdom of Great Britain, nor of its successors, the United Kingdom of Great Britain and Ireland and the present-day United Kingdom of Great Britain and Northern Ireland. It has always retained its internal self-government. In 1881, the Isle of Man Parliament, Tynwald, became the first national legislative body in the world to give women the right to vote in a general election, although this excluded married women.

The Manx economy is bolstered by its status as a tax haven and offshore banking destination. Insurance and online gambling each generate 17% of the GNP, followed by information and communications technology and banking with 9% each. This status has, however, also brought the problems of money laundering, financial crime and terrorism financing. The Isle of Man is also known for the TT Motorcycle Races, and the Manx cat, a breed with short or no tails. In 2016, UNESCO awarded the Isle of Man biosphere reserve status.