The Isle of Man (Manx: Mannin, also Ellan Vannin [ˈɛlʲan ˈvanɪnʲ]) or Mann (/ m æ n / man), [11] 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 ...