The northern Irish region where Magnus Barefoot was killed during campaigning in 1103.
Ulster, the northern Irish province, was the site where Magnus Barefoot of Norway was killed in 1103 during a campaign to extend Norwegian power in the Irish Sea region. His death ended Norwegian royal adventurism in Ireland.
Magnus Barefoot's campaigns in Scotland, Man, and Ireland represent the last phase of active Norwegian royal involvement in the Irish Sea world. After his death in Ulster, Norwegian influence in the region declined, though Orkney and the Western Isles remained under Norwegian sovereignty until the later medieval period.