HIDDA (-Jerusalem [945/75]). "Soror eorum [Gero marchiorum et Sigefridus] Hidda nominee" is named in the Annalista Saxo, which records her death in Jerusalem and that she was the mother of "Thietmarum marchionem et Geronem Coloniensem archiepiscopum"[40]. Thietmar also records the death in Jerusalem of "Gero's holy mother Hidda", undated but in a passage which records the subsequent invasion of Jerusalem by the Saracens implying that this occurred immediately after her burial[41]. She founded Kloster Nienburg with her sons Thietmar and Gero after her husband died[42]. m CHRISTIAN Graf im Nordthüringau und Schwabengau, Markgraf, son of --- (-after 945). The Chronicon Montis Serreni names "Cristiano marchione" as husband of "Hidda"