Mieszko I of Poland mentions a gift or dedication of Mieszko's land to the Pope (the act took place almost a hundred years earlier). It is roughly his borders that Poland was returned to in 1945. There is no certain information on Mieszko I's life before he took control over his lands. Only the "Lesser Poland Chronicle" gives the date of his birth as somewhere between the years 920–931 (depending on the version of the manuscript), however, modern researchers don't recognize the Chronicle as a reliable source. Several historians on the basis of their investigations postulated the date of Mieszko I's birth to have
Mieszko I of Poland 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. 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. Although most modern historians reject this claim, Bohemian historiography supported the Piast parentage of Vladivoj. In 978/79, Mieszko married Oda of Haldensleben (b. 955/60 – d. 1023), daughter of Dietrich of Haldensleben, Margrave of the Northern March. She was abducted by her future