Nielsen Hayden genealogy
Descendants of Willem I of Holland
Abt 1170 - 1222 (~ 52 years)Father: Floris III of Holland (Abt 1140 - 1 Aug 1190 Antioch, Anatolia)
Mother: Aleida of Scotland ( - Aft 11 Jan 1204)
Willem I of Holland (Abt 1170 - 4 Feb 1222)
Aleida van Gelre (Abt 1187 - 4 Feb 1218)
   └─ Floris IV of Holland (24 Jun 1210 - 19 Jul 1234)
    Machteld of Brabant (Abt 1200 - 21 Dec 1267)(m. Aft 5 Nov 1214)
       ├─ Adelaide of Holland (Abt 1230 - Between 1 Mar 1284 and 7 Apr 1284)
       │ John d'Avesnes (Apr 1218 Houffalize, Luxembourg (now Belgium) -
       │ 24 Dec 1257 Valenciennes, Nord-Pas-de-Calais, France)(m. 9 Oct 1246)
       │ 24 Dec 1257 Valenciennes, Nord-Pas-de-Calais, France)(m. 9 Oct 1246)
       │    ├─ John II of Hainault (1247 - 22 Aug 1304 bur.Church of the Franciscans, Valenciennes, Nord-Pas-de-
       │    │ Calais, France) =>
       │    │ Calais, France) =>
       │    │ + Philippa of Luxembourg (Abt 1252 -
       │    │ 6 Apr 1311 bur.Church of the Franciscans, Valenciennes, Nord-Pas-de-Calais, France)
       │    │ 6 Apr 1311 bur.Church of the Franciscans, Valenciennes, Nord-Pas-de-Calais, France)
       │    ├─ Jean II d'Avesnes (1247 - 11 Sep 1304 bur.Valenciennes, Nord-Pas-de-Calais, France) =>
       │    │ + Philippine de Luxemburg ( - 6 Apr 1311 bur.Valenciennes, Nord-Pas-de-Calais, France)
       │    │ (m. Between 1265 and 1270)
       │    │ (m. Between 1265 and 1270)
       │    └─ Guy d'Avesnes, Bishop of Utrecht (Abt 1253 - 28 May 1317) =>
       │     +
       └─ Margaretha van Holland (Abt 1234 - 26 Mar 1277)
        Hermann I von Henneberg (1224 - 18 Dec 1290)(m. 24 May 1249)
            + Otto V of Brandenburg (Abt 1246 - 3 Jul 1299)(m. 22 Oct 1268)