Nielsen Hayden genealogy
Descendants of (Unknown father of Count Gebhard of Süpplinburg)
(Unknown father of Count Gebhard of Süpplinburg)
   └─ Gebhard ( - 9 Jun 1075)
    Hedwig of Formbach ( - Between 1085 and 1090)
       └─ Lothar II von Süpplinburg, Holy Roman Emperor (Bef 9 Jun 1075 - 4 Dec 1137)
        Richenza von Northeim ( - 10 Jun 1141)(m. 1100)
           └─ Gertrud von Süpplinburg (18 Apr 1115 - Abt 18 Apr 1143) =>
            + Heinrich of Saxony (Abt 1100 - 20 Oct 1139)(m. 29 May 1127)