Nielsen Hayden genealogy
Descendants of Heinrich of Saxony
Abt 1100 - 1139 (~ 39 years)Father: Henry IX of Bavaria (1074 - 13 Dec 1126 Ravensburg, Upper Swabia, Germany)
Mother: Wulfhilde of Saxony (Abt 1075 - 29 Dec 1126 Weingarten Abbey, Ravensburg, Upper Swabia, Germany)
Heinrich of Saxony (Abt 1100 - 20 Oct 1139)
Gertrud von Süpplinburg (18 Apr 1115 - Abt 18 Apr 1143)(m. 29 May 1127)
   └─ Heinrich of Saxony (1129 - 6 Aug 1195 Braunschweig, Lower Saxony, Germany)
    Ida von Bliescastel
    :   └─ Mechtild of Saxony (Abt 1150 - Bef 1219)
    :    Heinrich Burwin I (Bef 1150 - 28 Jan 1227)(m. 1166)
    :       │ + Kristina ( - Aft 20 May 1248)(m. Abt 1200)
    :       └─ Johann I von Mecklenburg (Abt 1211 - 1 Aug 1264) =>
    :        + Luitgard von Henneberg ( - Bef 14 Jun 1267)(m. Abt 1230)
    Matilda of England (1156 London, England - 13 Jul 1189)(m. Between 1167 and 1168)
       ├─ Heinrich I of Rhein (Abt 1173 - 28 Apr 1227)
       │ Agnes von Hohenstaufen (1176 - 9 May 1204)(m. Jan 1194)
       │    │ + Hermann V von Baden ( - 16 Jan 1243)(m. Bef 13 Jul 1219)
       │    └─ Agnes (Abt 1201 - 16 Aug 1267 Munich, Bavaria, Germany) =>
       │     + Otto II of Bavaria (7 Apr 1206 Kelheim, Bavaria, Germany - 29 Nov 1253 Landshut, Bavaria, Germany)
       └─ 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)
           └─ Otto I of Brunswick-Lüneburg (1204 - 19 Jun 1252) =>
            + Matilde von Brandenburg (Abt 1210 - 10 Jun 1261)