Nielsen Hayden genealogy
Descendants of Mahaut de Châlon
- Bef 1019Father: Lambert of Châlon ( - Between 977 and 985)
Mother: Adélaïde ( - Aft 999)
Mahaut de Châlon ( - Bef 1019)
:   └─ Thibaut de Châlons ( - Abt 1065)
:    Ermentrude
:       └─ Adelaide de Châlons
:        Guillaume de Thiern ( - Bef 1075)
:            +
Henry I of Burgundy (Abt 946 - 15 Oct 1002)(m. 998)
   └─ Aremburge de Vergy
    Dalmas I of Semur ( - 1048)(m. Abt 1013)
       └─ Helie of Semur (Abt 1015 -
        Aft 1055 Priory of the Holy Trinity of Marcigny-lès-Nonnains, Burgundy, France)
        Aft 1055 Priory of the Holy Trinity of Marcigny-lès-Nonnains, Burgundy, France)
        Robert I (Abt 1011 - 21 Mar 1075)(m. Abt 1033)
           │ + (Unknown wife of Henry I of Burgundy) ( - Aft 5 Jul 1074 bur.Besançon, France)
           └─ Constance of Burgundy (1046 - 1092 bur.Royal Monastery of San Benito, Sahagun, León, Spain) =>
            + Alfonso VI, King of Leon, Castile, and Galicia (Abt 1039 -
            1 Jul 1109 Toledo, Toledo, Castilla-La Mancha, Spain)(m. 1079)
            1 Jul 1109 Toledo, Toledo, Castilla-La Mancha, Spain)(m. 1079)