Nielsen Hayden genealogy
Descendants of Richenza von Northeim
- 1141Father: Heinrich von Northeim (Abt 1051 - Bef 10 Apr 1101)
Mother: Gertrude von Meissen (Abt 1060 - 9 Dec 1117)
Richenza von Northeim ( - 10 Jun 1141)
Lothar II von Süpplinburg, Holy Roman Emperor (Bef 9 Jun 1075 - 4 Dec 1137)(m. 1100)
   └─ Gertrud von Süpplinburg (18 Apr 1115 - Abt 18 Apr 1143)
    Heinrich of Saxony (Abt 1100 - 20 Oct 1139)(m. 29 May 1127)
       └─ Heinrich of Saxony (1129 - 6 Aug 1195 Braunschweig, Lower Saxony, Germany)
        Ida von Bliescastel
        :    + Heinrich Burwin I (Bef 1150 - 28 Jan 1227)(m. 1166)
        Matilda of England (1156 London, England - 13 Jul 1189)(m. Between 1167 and 1168)
           │ + Agnes von Hohenstaufen (1176 - 9 May 1204)(m. Jan 1194)
           └─ Wilhelm of Brunswick-Lüneburg (11 Apr 1184 Winchester, Hampshire, England -
            13 Dec 1213 Lüneburg, Lower Saxony, Germany) =>
            13 Dec 1213 Lüneburg, Lower Saxony, Germany) =>
            + Helene of Denmark (Abt 1180 - 22 Nov 1233)(m. Jul 1202 Hamburg, Germany)