He was saved from an attacking army by Ulfcytel after ordering the St. Brice's Day massacre and enraging his rival Sweyn Forkbeard.
The Enham regulations were drawn up by Wulfstan II, who served as an advisor to both this man and his successor. His reign saw Byrhtnoth lose the Battle of Maldon to the Vikings, and this king also paid a gigantic Danegeld to stop the armies of Thorkell the Tall. He was saved from an attacking army by Ulfcytel after ordering the St. Brice's Day massacre and enraging his rival Sweyn Forkbeard. Eventually supplanted as King of England by Sweyn's son Canute, for 10 points, identify this father of Edward the Confessor whose nickname comes from his "ill counsel" rather than his unpreparedness.
The Enham regulations were drawn up by Wulfstan II, who served as an advisor to both this man and his successor.
{Aethelred} the {Unready} [prompt on partial; accept {Aethelred} II or {Aethelred Unraed}; accept {Canute} the {Great} or equivalents until "successor"]