The Isle of Man became separated from Britain and Ireland by about 8000 BC. It appears that colonisation took place by sea sometime before 6500 BC . [1] The island has been visited by various raiders and trading peoples over the years. After being settled by people from Ireland in the first millennium, the Isle of Man was converted to Christianity and then suffered raids by Vikings from Norway . After becoming subject to suzerainty to Norway as part of the Kingdom of Mann and the Isles , the Isle of Man later became a possession of the Scottish and then English crowns. Mesolithic The Isle of Mann effectively became an island around 8,500 years ago when rising sea levels caused by the melting glaciers cut Mesolithic Britain off from continental Europe for the last time. A land bridge had existed between the Isle of Man and Cumbria prior to this date, although the location and opening of ...