Nielsen Hayden genealogy
Descendants of Beatrice de Vitry-Réthel
1135 - 1185 (~ 55 years)Father: Vuiton (Abt 1100 - ??)
Mother: Beatrix of Namur ( - 1160 Rethel, Ardennes, Champagne-Ardenne, France)
Beatrice de Vitry-Réthel (Between 1130 and 1135 - 31 Mar 1185)
Roger II, King of Sicily (Between 22 Dec 1095 and 1097 - Between 27 Jan 1154 and 26 Feb 1154)(m. 1151)
   └─ Constance of Sicily ( - 27 Nov 1198)
    Heinrich VI, Holy Roman Emperor (Nov 1165 - 28 Sep 1197 Messina, Sicily)(m. 27 Jan 1186 Milan, Lombardy, Italy)
       └─ Friedrich II, Holy Roman Emperor (26 Dec 1194 - 13 Dec 1250)
        Bianca Lancia (Abt 1212 - ??)
        :    + Beatrice of Savoy (4 Mar 1223 - Bef 10 May 1259)(m. Abt 1248)
        (Unknown mistress of Friedrich II)
        :   └─ Margherita de Svevia ( - Between 1297 and 1298) =>
        :    + Tommaso d'Aquino (Abt 1220 - 14 Mar 1273 bur.St. Maria delle Monache, Capua, Campania, Italy)
        :    (m. 1247)
        :    (m. 1247)
        Isabella of England (1214 - 1 Dec 1241)(m. 20 Jul 1235 Worms, Germany)
           └─ Margarethe von Hohenstaufen (Abt Feb 1237 - 8 Aug 1270 Frankfurt-am-Main, Germany) =>
            + Albrecht II of Meissen (1240 - 20 Nov 1315)(m. 1254)