The Battle of the Isle of Man was a battle fought in 1158 between the Norse Gofraidh mac Amhlaibh (Godred II), King of Mann and the Isles and Celtic Somhairle MacGillebride (Somerled), King of Cinn Tìre (Kintyre), Argyll and Lorne, on the Isle of Man.
Gofraid was claimed as an ancestor in the eighth generation of Somerled, progenitor of the Clann Somhairle and thus Clan Donald, and it seems that these entries were added to glorify Clan Donald.
After Somerled's death in 1164 his kingdom was split between his three sons, Ragnall in Islay and Kintyre, Dughall in Lorne and the other Argyll islands, and Angus holding Arran and Bute.
From the 9th century until the Treaty of Perth in 1266 CE control of the Hebrides alternated between the kingdoms of Norway and of Alba to the east, and independent Gaelic/Scandinavian rulers such as Ketil Flatnose, Maccus mac Arailt, Godred Crovan and Somerled.