Nielsen Hayden genealogy
Descendants of Hildegard of Flanders
- 990Father: Arnulf I "The Great" (Abt 885 - 964 bur.Abbey of Saint-Pierre, Ghent, Flanders)
Mother: Adèle de Vermandois (Between 910 and 915 - 958 bur.Abbey of Saint-Pierre, Ghent, Flanders)
Hildegard of Flanders ( - 990)
Dirk II ( - 6 May 988)
   └─ Arnulf of Ghent (951 Ghent, Flanders - 18 Sep 993 Winkel, West Friesland)
    Luitgard of Luxembourg ( - Aft 1005 bur.Egmond Abbey, Bergen, North Holland)(m. May 980)
       └─ Dirk III of Friesland (Between 981 and 989 - 27 May 1039 bur.Egmond Abbey, Bergen, North Holland)
        Othelindis of Nordmark ( - 31 Mar 1044 Saxony)
           └─ Floris I of Holland (Abt 1017 Vlaardingen, Zuid-Holland, Netherlands -
            28 Jun 1061 Gelderland, Netherlands) =>
            28 Jun 1061 Gelderland, Netherlands) =>
            + Gertrude of Saxony (Abt 1030 - 4 Aug 1113)(m. Abt 1050)