Harthacnut was unmarried and had no known children. On 8 June 1042, Harthacnut attended a wedding in Lambeth. The groom was Tovi the Proud, former standard-bearer to Cnut, and the bride was Gytha, daughter of the courtier Osgod Clapa. Harthacnut presumably consumed large quantities of alcohol. As he was drinking to the health of the bride, he ""died as he stood at his drink, and he suddenly fell to the earth with an awful convulsion; and those who were close by took hold of him, and he spoke no word afterwards..."" The likely cause of death was a stroke, ""brought about by an excessive intake of alcohol"". Sten Körner noted that the death of Harthacnut could be part of a plot, but did not further explore the notion, though the implication would be that Edward the Confessor was behind this plot. points that Edward benefited from the sudden death of Harthacnut and that while Godwin, Earl of Wessex, was the father-in-law to Edward, he had once led an uprising against his son-in-law. He died suddenly after dining with said son-in-law, again pointing suspicion at Edward as the probable culprit behind both deaths. Katherine Holman was certain that Harthacnut was poisoned but felt that the culprit will never be known with certainty due to "no shortage of discontented candidates". 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."" According to the "Encomium", Edward the Confessor already served as co-ruler of England since 1041. There is an emphasis on Harthacnut, Edward, and Emma serving as a trinity of rulers, in emulation of the Holy Trinity. Edward, by surviving his co-ruler, would be king by default.