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Son of Theodoric of Ringelheim and Ragnhildis Ludmilla von Ringleheim Brother of Amalrada Frederuna Billung von Ambergau; Immed III. von Westsachsen, Graf in Westsachsen; Reginbern of Westphalia; Matilda of Ringelheim; Amalrada von Hamalant and 1 other; and Bia von Ringelsheim« less
According to the Foundation for Medieval Genealogy page on Saxony:
http://fmg.ac/Projects/MedLands/SAXONY.htm#Mathildedied968
WIDUKIND . Widukind names (in order) "Widukind, Immed et Reginbern" as brothers of Queen Mathilde[39].