HEDWIG (-[1090/93]). The Vita Wirntonis names "Fridericus" as father of "Hedwigis, mater Lotharii regis"[468]. According to the 14th century Genealogia comitum Neuburgensium sive Formbacensium, "Hadewic mater Lotharii regis et Ite comitisse de Purchausen" was the only daughter of "Fridericus senioris Tiemonis filius" & his wife[469]. Her alleged first marriage to "Graf Heinrich" is based on a misinterpretation of the report that Simon Duke of Lorraine married "his stepmother's daughter whom she had by her first husband Graf Heinrich"[470], assuming that Duke Simon was therefore the son of Hedwig's second husband, Thierry II Duke of Lorraine, by his second wife Gertrud de Flandre. According to Europäische Stammtafeln[471], Duke Simon was the son of his father's first wife Hedwig. Poull[472] refers to several sources which apparently indicate that he was the son of Duke Thierry II's second marriage, including Duke Simon's own act dated 11 Apr 1126 referring to his deceased "mother Gertrude". However, the chronology is highly unfavourable for this possibility. If Duke Simon's wife had been the daughter of Hedwig von Formbach, by an otherwise unknown first husband, she must have been born before 1072, considering that Hedwig gave birth to two children by her husband Gerhard von Süpplingenburg who died in 1075. This would be incompatible with Duke Simon's wife having given birth to at least seven children, even if their marriage took place as early as [1112/13] as suggested by Poull. m firstly GERHARD von Süpplingenburg Graf im Harzgau, son of Graf im Harz- und Derlingau und in Nordthüringen & his wife Ida von Querfurt (-killed in battle Homburg 9 Jun 1075). m secondly ([1080]) as his first wife, THIERRY II Duke of Lorraine, son of GERARD Duke of Upper Lotharingia [Matfriede] & his wife Hadwide --- (-30 Dec 1115).
http://fmg.ac/Projects/MedLands/BAVARIAN%20NOBILITY.htm#HedwigFormbachdied10901093