The political agreement between Harthacnut and Magnus the Good included the appointment of the latter as heir to Harthacnut. At the time, the agreement would have only affected the throne of Denmark. The Heimskringla reports that when Harthacnut died, Magnus extended his claim to England. He reportedly sent a letter to Edward the Confessor, pressing his claim to the English throne and threatening invasion. His own heir, Harald Hardrada, would also press this claim. Both considered themselves legal heirs to Harthacnut. The Fagrskinna contains a scene where Magnus proclaims that ""I will take possession of all the Danish empire or else die in the attempt.""