Nielsen Hayden genealogy
Descendants of Roger II, King of Sicily
1097 - 1154 (~ 58 years)Father: Roger I d'Hauteville (1031 - 22 Jun 1101)
Mother: Adelaide de Savona (Abt 1075 - 16 Apr 1118)
Roger II, King of Sicily (Between 22 Dec 1095 and 1097 - Between 27 Jan 1154 and 26 Feb 1154)
Elvira of Castile (Abt 1097 - 1135)(m. 1120)
:   └─ Roger (Abt 1121 - 12 May 1148)
:    Bianca de Lecce
:    :   └─ Tancred, King of Sicily (1135 - 20 Feb 1194)
:    :    Sibilla d'Aquino (Abt 1153 - 27 Mar 1204)
:    :        + Gauthier III de Brienne (Abt 1165 - Jun 1205 Sarno, Campania, Italy)
:    :        : (m. 1200 Melun, Seine-et-Marne, Île-de-France, France)
:    :        : (m. 1200 Melun, Seine-et-Marne, Île-de-France, France)
:    :        + Giacomo Sanseverino (Abt 1180 - Abt 1213)(m. Abt 1206)
:    + Elisabeth de Champagne (1130 - ??)(m. Between 1139 and 1140)
Beatrice de Vitry-Réthel (Between 1130 and 1135 - 31 Mar 1185)(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)