Boles%C5%82aw III Wrymouth

Bolesaw III Wrymouth , was a Duke of Lesser Poland, Silesia and Sandomierz between 1102 and 1107 and over the whole Poland between 1107 and 1138. He was the only child of Prince Wadysaw I Herman and his first wife Judith, daughter of Vratislaus II of Bohemia.

Oswald Balzer refuted Bielowskis theory and pointed that Judiths death was on the night between 2425 December 1086, and the birth of Bolesaw was four months before, onAugust. According to him, if Judith died on the night between 2424 December, are possible discrepancies in determining the exact date of the event. All known sources who placed the death of Judith, would then right. Gallus wrote that Judith died shortly after giving birth to a son. Later sources interpret this as a death in childbirth and Cosmas of Prague followed this fact, despite he didnt received the information at first hand. Hence, his mistake would result in this point. In contrast, the right indicated by Gallus date of birth of Bolesaw would beAugust. In the medieval tradition the year began onDecember. In that case, the reports of Cosmas must be concluded that Bolesaw was born yet in 1085. This information, however, was in contradiction with the reports of the Kalendarz krakowski, who gave the year 10

Source: Wikipedia