The parentage of the wife of Graf Dedo is deduced from her brother Bernhard being described as avunculus of her son, although she is not named in this passage. Thietmar is more explicit, stating that Dedo married "Markgraf Dietrich's daughter, Thiedburga". 1
Marriage Information:
Thietburga married Gf. Dedo I VON MERSEBURG, son of Gf. Dietrich IM HASSEGAU. (Dedo I VON MERSEBURG died on 13 Nov 1009 in battle near Mose bei Wolmirstedt.)
Sources
1 Foundation for Medieval Genealogy, Medlands: Thietburga.