Nielsen Hayden genealogy
Descendants of Frédéric I
915 - 978 (~ 68 years)Father: Wigeric ( - Aft 19 Jan 916 bur.Hastière, Belgium)
Mother: Cunegonde (Between 885 and 895 - ??)
Frédéric I (Between 910 and 915 - 18 May 978)
Beatrix of Lorraine ( - Aft 987)(m. 954)
   └─ Thierry I (Abt 965 - Between 11 Apr 1026 and 2 Jan 1027)
    Richilde (m. 985)
       └─ Frederick II of Lorraine (Abt 995 - 1027)
        Mathilde of Swabia ( - Abt 1032)(m. Aft 1011)
            + Louis de Montbéliard (Between 1005 and 1019 - Between 1070 and 1073)(m. 1032)