Harthacnut (; "Tough-knot"; – 8 June 1042), traditionally Hardicanute, sometimes referred to as Canute III, was King of Denmark from 1035 to 1042 and King of the English from 1040 to 1042. Harthacnut was the son of King Cnut the Great (who ruled Denmark, Norway, and England) and Emma of Normandy. When Cnut died in 1035, Harthacnut struggled to retain his father's possessions. Magnus I took control of Norway, but Harthacnut succeeded as King of Denmark and became King of England in 1040 after the death of his half-brother Harold Harefoot, king of England. Harthacnut himself died suddenly in 1042 and was succeeded by Magnus in Denmark and Edward the Confessor in England. Harthacnut was the last Dane to rule England. Early life Harthacnut was born shortly after the marriage of his parents in July or August 1017. Cnut had put aside his first wife Ælfgifu of Northampton to marry Emma, and according to the Encomium Emmae Reginae, a book she inspired many years later, Cnut agreed that any sons of their marriage should take precedence over the sons of his first marriage. In 1023, Emma and Harthacnut played a leading role in the translation of the body of the martyr St Ælfheah from London to Canterbury, an occasion seen by Harthacnut's biographer, Ian Howard, as recognition of his position as Cnut's heir in England. In the 1020s Denmark was threatened by Norway and Sweden, and in 1026 Cnut decided to strengthen its defences by bringing over his eight-year-old son to be the future king under a council headed by his brother-in-law, Earl Ulf. However, Ulf alienated Cnut by getting the Danish provinces to acknowledge Harthacnut as king without reference to Cnut's overall authority and by failing to take vigorous measures to meet Norwegian and Swedish invasions, instead waiting for Cnut's assistance. In 1027, Cnut arrived with a fleet. He forgave Harthacnut his insubordination in view of his youth but had Ulf murdered. He drove the invaders out of Denmark and established his authority over Norway, returning to England in 1028 and leaving Denmark to be ruled by King Harthacnut. Cnut had left Norway under the rule of Håkon Eiriksson, who drowned in a shipwreck in 1029 or 1030. Cnut then appointed his son Svein to rule Norway with the assistance of Ælfgifu, Cnut's first wife and Svein's mother. However, they made themselves unpopular by heavy taxation and favouring Danish