Nielsen Hayden genealogy
Ancestors of Ernst of Brunswick
Abt 1297 - 1361 (~ 64 years) ┌── Otto I of Brunswick-Lüneburg (1204 - 19 Jun 1252) =>
┌── Albrecht I (1236 - 15 Aug 1279)(m. 1 Nov 1266)
│ └── Matilde von Brandenburg (Abt 1210 - 10 Jun 1261) =>
│
┌── Heinrich I of Brunswick (Aug 1267 - 7 Sep 1322)(m. 1282)
│ │
│ │ ┌── Boniface II (Abt 1202 - Between 12 Jun 1253 and 10 Dec 1256)(m. 9 Dec 1235) =>
│ └── Alessina de Monferrato ( - 5 Feb 1285)(m. 1 Nov 1266)
│ └── Margereta of Savoy ( - 1254)(m. 9 Dec 1235) =>
│
Ernst of Brunswick (Abt 1297 - 11 Mar 1361)
│
│ ┌── Heinrich von Meissen (Abt 1215 - Bef 8 Feb 1288)(m. 1 May 1234) =>
│ ┌── Albrecht II of Meissen (1240 - 20 Nov 1315)(m. 1254)
│ │ └── Constance of Austria (6 May 1212 - Bef 5 Jun 1243)(m. 1 May 1234) =>
│ │
└── Agnes von Meissen (Bef 1264 - Aft 1 Feb 1332)(m. 1282)
│
│ ┌── Friedrich II, Holy Roman Emperor (26 Dec 1194 - 13 Dec 1250)(m. 20 Jul 1235 Worms, Germany) =>
└── Margarethe von Hohenstaufen (Abt Feb 1237 - 8 Aug 1270 Frankfurt-am-Main, Germany)(m. 1254)
└── Isabella of England (1214 - 1 Dec 1241)(m. 20 Jul 1235 Worms, Germany) =>