Hedwig von Formbach (c1058 -c1090), heiress to Süpplingenburg Castle.

Parents: Frederick, Count of Formbach & Gertrude of Haldensleben

x Gerhard von Süpplingenburg Graf im Harzgau

• Lothar von Süpplingenburg becomes Lothar III King of Germany ([1/8] Jun 1075-Breitenwang am Loch in Tirol 4 Dec 1137, bur Königslutter)
• Ida (d.1138) x who married Sighard IX (d.1104)

xx Theodoric II, Duke of Lorraine

• Simon (1076 – 1138), who succeeded Theoderic as Duke of Lorraine x Adelaide of Leuven (d. 1158), daughter of his stepmother Gertrude and Henry III, Count of Leuven.
• Gertrude (who later changed her name to Petronilla) (d 1144) x Floris II of Holland

Sources:

• http://fmg.ac/Projects/MedLands/SAXONY.htm#Lothardied1137
• https://en.wikipedia.org/wiki/Hedwig_of_Formbach