J. Steenstrup suggests that Canute's sister may have been named after her mother, hence coining (the now generally agreed upon) hypothesis, that her Old Polish name is Świętosława, but only as a reconstruction based on a single mention of her daughter's name and the hypothesis that she named her daughter after herself.
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In the 13th century collection of sagas, Heimskringla, Snorri Sturluson tells that Sweyn Forkbeard was captured in an attack on the Jomsvikings, and turned over to Burislav, king of Wendland.