Nielsen Hayden genealogy
Descendants of (Unknown daughter of Richard II, Duke of Normandy)
Father: Richard II ( - 23 Aug 1026 Fécamp, Normandy, France)
Mother: Judith of Brittany (982 - 28 Jun 1017 bur.Bernay Abbey, Bernay, Normandy, France)
(Unknown daughter of Richard II, Duke of Normandy)
Baldwin IV "The Bearded" (980 - 29 May 1035 bur.Abbey of Saint-Pierre, Ghent, Flanders)(m. Aft Feb 1030)
   └─ Judith of Flanders (Abt 1033 - 5 Mar 1094 Weingarten Abbey, Ravensburg, Upper Swabia, Germany)
    + Tostig Godwinson ( - 25 Sep 1066)(m. Bef Sep 1051)
    Welf I of Bavaria ( - 6 Nov 1101 Paphos, Cyprus)(m. 1071)
       └─ Henry IX of Bavaria (1074 - 13 Dec 1126 Ravensburg, Upper Swabia, Germany)
        Wulfhilde of Saxony (Abt 1075 - 29 Dec 1126 Weingarten Abbey, Ravensburg, Upper Swabia, Germany)
        (m. Abt 1100)
        (m. Abt 1100)
           │ + Gebhard III of Sulzbach (Abt 1114 - 28 Oct 1188)(m. 1129)
           │ + Rudolf von Bregenz ( - Between 27 Apr 1160 and 28 Apr 1160)
           │ + Gertrud von Süpplinburg (18 Apr 1115 - Abt 18 Apr 1143)(m. 29 May 1127)
           └─ Judith of Bavaria (19 May 1100 - Aft 22 Feb 1130 bur.Waldburg, Heiligen Forst, Alsace) =>
            + Frederick II von Hohenstaufen (1090 - 4 Apr 1147)(m. 1121)