Given the relatively close relationship between Przemysł II and Margaret (both were great-grandchildren of Přemysl Otakar I of Bohemia), they needed a papal dispensation in order to marry.
[2] The wedding ceremony took place shortly before 13 April 1293; according to some historians, probably on this occasion the betrothal between Przemysł II's daughter Ryksa and Otto of Brandenburg-Salzwedel, Margaret's brother, was also celebrated.
[5] It's unknown whether the chronicler found this information, from earlier sources or deduced it based on the simple relationship:[citation needed] because Margaret came from the family accused of the murder, she had to participate.
Sometime later, another marriage was arranged to Margaret, this time with Albert III, who ruled jointly with his brothers Eric I and John II the Duchy of Saxe-Lauenburg, partitioned from Saxony in 1296.
Because Albert III and Margaret are closely related (both are members of the House of Ascania), a papal dispensation was granted in Anagni on 24 September 1302; the marriage was probably celebrated shortly after.