Magnus Barefoot

Magnus Olafsson took Norway's throne in 1093 after his father's death, sharing it uneasily with a cousin until 1095, then putting down a noble revolt. From 1098 to 1099 he swept the Irish Sea with warships, forcing Orkney, the Hebrides, and Mann under his crown and building strongholds on Mann itself; a treaty with Scotland locked in Norwegian control, and he sailed to Wales to beat back Norman invaders on Anglesey. Back home he turned east, raiding into Swedish Dalsland and Västergötland until a 1101 peace deal traded his marriage to a Swedish princess for the disputed borderland. In 1102 he launched west again - perhaps aiming for all of Ireland - and cut an alliance with Munster's king that gave him Dublin. The next August, foraging for supplies near Ulster, he walked into an ambush by the Ulaid and was killed at thirty.