The Isle of Man, also known as Mann, is an island and self-governing British Crown Dependency in the Irish Sea between Great Britain and Northern Ireland. The head of state, Queen Elizabeth II, holds the title Lord of Mann and is represented by a Lieutenant Governor. The United Kingdom is responsible for the isle's military defence.
Humans have lived on the island since before 6500 BC. Gaelic cultural influence began in the 5th century AD, 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 Mann and the Isles between 1099 and 1103.
In 1266, the island became part of Scotland under the Treaty of Perth, after being ruled by Norway. 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.