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In page Mieszko I:

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According to one hypothesis there was another daughter of Mieszko, married to a Pomeranian Slavic prince; she could be a daughter of Dobrawa or of one of the previous pagan wives. According to one theory, this unnamed daughter of Mieszko I and her Pomeranian husband were the parents of Zemuzil, Duke of Pomerania. Also, a theory exists (apparently based on Thietmar and supported by Oswald Balzer in 1895) that Vladivoj, who ruled as Duke of Bohemia in 1002–1003, was a son of Mieszko and Dobrawa.[citation needed] Although most modern historians reject this claim, Bohemian historiography supported the Piast parentage of Vladivoj.[2]