Extract from Manx Society volume 4 ('Monumenta de Insula Manniae - Vol 1'), presenting a translation/transcription of the account of King Magnus's death in Ireland from the Icelandic Sagas. The document describes the ambush and battle at Magh Coba near Downpatrick where Magnus was killed after his raid on Wales and Ireland. Relevant to understanding the medieval history and Norse sovereignty of the Isle of Man.