Doubravka of Bohemia at the cost of breaking their marriage and with it the Polish-Bohemian Alliance). In the end, she finally obtained the conversion of Mieszko I and with him, of all Poland. In turn, the 12th century chronicler Gallus Anonymus says that Doubravka came to Poland surrounded by secular and religious dignitaries. She agreed to marry Mieszko I providing that he was baptized. The Polish ruler accepted, and only then was able to marry the Bohemian princess. However, modern historians allege that the baptism of Mieszko I was dictated by political benefits and should not be attributed to any action of Doubravka,
Mieszko Kazimierzowic "Gesta principum Polonorum" written in the early 12th century, put Mieszko third in order, among his brother. Modern historian, Janusz Bieniak, has supposed that Mieszko was the second son of Casimir I and was older than Władysław Herman, but most scholars disagree with this hypothesis. The date of Mieszko's birth was given by "Rocznik krakowski" (Kraków Annals). This source omitted dates of birth of Mieszko's brothers. Kazimierz Jasiński thought that "Rocznik" was started shortly before Mieszko's birth and this was the reason for absence of his older brothers. Przemysław Wiszewski supposed tha Casimir I chose Mieszko as his successor and