 However, the noblemen of both countries brought the two kings together at the Göta älv, the border between their kingdoms.They made peace and agreed that the first of them to die would be succeeded by the other.In 1042 Harthacnut died while in England, and Magnus also became King of Denmark, in spite of a claim by Cnut's nephew Sweyn Estridsen, whom Harthacnut had left in control of Denmark when he went to England, and who had some support.