Nielsen Hayden genealogy
Descendants of Asta Gudbrandsdottir
Father: Gudbrand Kula of the Upplands
Mother: 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)
:    Astrid Ólafsdóttir ( - Between 1021 and 1022)(m. Feb 1018)
:       └─ Úfhildr Ólafsdóttir (Abt 1023 - 24 May 1070)
:        Ordulf of Saxony (Abt 1020 - 28 Mar 1072)(m. Nov 1042)
:           └─ Magnus of Saxony (Abt 1045 - 23 Aug 1106 bur.Artlenburg, Lower Saxony) =>
:            + Sophia of Hungary (Abt 1050 - 18 Jun 1095)(m. Between 1070 and 1071)
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
           └─ Magnus III, King of Norway (Abt 1070 - 24 Aug 1103 Ireland) =>
            + (Unknown mistress of Magnus III of Norway)