Nielsen Hayden genealogy
Descendants of Gerhard I
- 1038Father: Hugo VI of Egisheim (Abt 970 - ??)
Mother: Heilwig von Dagsburg ( - 1046)
Gerhard I ( - 1038)
   └─ Hildegard of Egisheim-Dagsburg (Abt 1028 - Abt 1095)
    Frederick of Büren (Abt 1020 - 1053)(m. Abt 1042)
       └─ Frederick I of Swabia (Abt 1050 - Bef 21 Jul 1105 bur.Lorch Abbey, Baden-Württemberg, Germany)
        Agnes of Germany (1073 - 24 Sep 1143 bur.Klosterneuberg, Austria)(m. Abt 1086)
           │ + Freidrich III von Pettendorf ( - 3 Apr 1119)
           ├─ Frederick II von Hohenstaufen (1090 - 4 Apr 1147) =>
           │ + Judith of Bavaria (19 May 1100 - Aft 22 Feb 1130 bur.Waldburg, Heiligen Forst, Alsace)(m. 1121)
           │ + Agnes von Saarbrücken (m. Between 1131 and 1135)
           └─ Konrad III of Swabia, King of the Romans (1093 - 15 Feb 1152 Bamberg, Bayern, Germany) =>
            + Gertrud von Komburg ( - Between 1130 and 1131)(m. Abt 1115)