Eric Bloodaxe

Eric Haraldsson held the throne of Norway for two years starting in 932, then lost it. A decade and a half later he surfaced in northern England, where he ruled Northumbria in two separate stints: 947 to 948, then 952 to 954. The nicknames stuck harder than the crowns — blóðøx in Old Norse, fratrum interfector in Latin — both pointing to the same reputation. He died around 954, having spent more time being expelled from kingdoms than sitting securely in them.