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In page Godwin, Earl of Wessex:

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After Cnut seized the throne in 1016, Godwin's rise was rapid. By 1018 he was an earl, probably of eastern Wessex, and then by around 1020 of all Wessex.[1] Between 1019 and 1023 he accompanied Cnut on an expedition to Denmark, where he distinguished himself, and shortly afterwards married Gytha, the sister of the Danish earl, Ulf, who was married to Cnut's sister, Estrid.[4]