Nielsen Hayden genealogy
Descendants of Ulfhilde
Ulfhilde
   └─ Asta Gudbrandsdottir
    Harald Grenske (Abt 952 - Abt 995)
    :   └─ St. Olaf II Haraldsson, King of Norway (Abt 995 - 31 Aug 1030 Stiklestad, Verdal, Nord-Trøndelag,
    :    Norway)
    :    Norway)
    :    Astrid Ólafsdóttir ( - Between 1021 and 1022)(m. Feb 1018)
    :        + Ordulf of Saxony (Abt 1020 - 28 Mar 1072)(m. Nov 1042)
    Sigurd Syr (Abt 960 - 1018)
       └─ Harald Hardrada, King of Norway (Abt 1015 - 25 Sep 1066 Stamford Bridge, Yorkshire, England)
        Thora Thorbergsdatter (1025 - ??)
           └─ Olav III, King of Norway (Abt 1050 - 22 Sep 1093 Håkeby, Tanum, Västra Götaland, Sweden) =>
            + Thora Jonsdatter