Sweyn Forkbeard all England in 1016, following the deaths of Æthelred and his son Edmund Ironside; he succeeded his brother as King of Denmark in 1019 and eventually also ruled Norway, parts of Sweden, Pomerania, and Schleswig. Cnut and his sons, Harold Harefoot and Harthacnut, ruled England over a combined 26-year period (1016–1042). After Harthacnut's death, the English throne reverted to the House of Wessex under Æthelred's younger son Edward the Confessor (reigned 1042–1066). Sweyn's daughter, Estrid Svendsdatter, was the mother of King Sweyn II of Denmark. Her descendants continue to reign in Denmark to this day. One of them, Margaret of
Edward II of England the Count of Flanders, but this too failed after it was blocked by King Philip IV of France. Between 1297 and 1298, Edward was left as regent in charge of England while the king campaigned in Flanders against Philip IV, who had occupied part of the English king's lands in Gascony. On his return, Edward I signed a peace treaty, under which he took Philip's sister, Margaret, as his wife and agreed that Prince Edward would in due course marry Philip's daughter, Isabella, who was then only two years old. In theory, this marriage would mean that the disputed Duchy