Nielsen Hayden genealogy
Descendants of Albrecht I of Saxony
Abt 1180 - 1261 (~ 81 years)Father: Bernhard III of Saxony (1140 - 9 Feb 1212)
Mother: Judith of Poland (Abt 1152 - Aft 1201)
Albrecht I of Saxony (Abt 1180 - 8 Nov 1261)
Agnes von Thüringen (Abt 1206 - Bef 1247)
:   └─ Jutta of Saxony ( - 23 Dec 1287)
:    Johann I of Brandenburg (1213 - 4 Apr 1266)(m. 7 May 1255)
:       ├─ Agnes of Brandenburg (Between 1256 and 1261 - Oct 1304 bur.Ringsted, Denmark)
:       │ Eric V Klipping, King of Denmark (1249 Lolland, Denmark - 22 Nov 1286 Finderup, Viborg, Denmark)
:       │ (m. 11 Nov 1273)
:       │ (m. 11 Nov 1273)
:       │    └─ Richza of Denmark ( - Between 12 Mar 1303 and 27 Oct 1308) =>
:       │     + Nikolaus II of Werle (Abt 1265 - 12 Oct 1316)(m. Bef 1301)
:       └─ Heinrich I of Brandenburg (Abt 1260 - 14 Feb 1318 bur.Chorin Cloister, Chorin, Brandenburg, Germany)
:        Agnes of Bavaria (Between 1276 and 1278 - 22 Jul 1345 Sangerhausen, Saxony-Anhalt, Germany)
:        (m. Aft Nov 1298 Nürnberg, Bavaria, Germany)
:        (m. Aft Nov 1298 Nürnberg, Bavaria, Germany)
:            + Magnus I of Brunswick (Abt 1304 - Between 15 Jun 1369 and 15 Aug 1369 bur.St. Michaelis, Lüneberg,
:            Lower Saxony, Germany)(m. Abt 1327)
:            Lower Saxony, Germany)(m. Abt 1327)
Agnes of Austria (19 Feb 1206 - 29 Jul 1226)(m. 1222)
:   └─ Jutta of Saxony (Abt 1224 - ??)
:    Erik IV-VI, King of Denmark (1216 - 10 Aug 1250)(m. 17 Nov 1239)
:       └─ Sofia of Denmark, Queen Consort of Sweden (Abt 1241 - 1286)
:        Valdemar Birgersson, King of Sweden (1237 - 26 Dec 1302)(m. 1260)
:            + Gerhard II of Holstein (Bef 1 Nov 1253 - 25 Oct 1312 bur.Hamburg Cathedral, Hamburg, Germany)
:            (m. 12 Dec 1275 Lödöse, Sweden)
:            (m. 12 Dec 1275 Lödöse, Sweden)
Helene of Brunswick-Lüneburg (18 Mar 1223 - 6 Sep 1273)(m. Between 1247 and 1248)
   ├─ Albrecht II of Saxony ( - 25 Aug 1298 Aken, Saxony-Anhalt, Germany)
   │ Agnes of Habsburg (Abt 1257 - 11 Oct 1322 Wittenberg, Saxony-Anhalt, Germany)
   │ (m. Oct 1273 Aachen, Westphalia, Germany)
   │ (m. Oct 1273 Aachen, Westphalia, Germany)
   │    ├─ Anna of Saxe-Wittenberg ( - 22 Nov 1327 bur.Wismar, Mecklenburg-Vorpommern, Germany)
   │    │ Heinrich II of Mecklenburg (Abt 1267 Riga, Latvia -
   │    │ 21 Jan 1329 Sternberg, Mecklenburg-Vorpommern, Germany)(m. 6 Jul 1315)
   │    │ 21 Jan 1329 Sternberg, Mecklenburg-Vorpommern, Germany)(m. 6 Jul 1315)
   │    │     + Heinrich II of Holstein (Between 1316 and 1318 - Bef 17 Apr 1390)(m. Abt 1366)
   │    └─ Rudolf I of Saxony (Abt 1280 - 12 Mar 1356 bur.Wittenberg, Saxony-Anhalt, Germany)
   │     Agnes of Lindow-Ruppin ( - 9 May 1343 bur.Franciscan cloister, Wittenberg, Saxony-Anhalt, Germany)
   │     (m. Aft 9 Apr 1331)
   │     (m. Aft 9 Apr 1331)
   │        └─ Wenzel of Saxony (Abt 1337 - 15 May 1388 Hannover, Lower Saxony, Germany) =>
   │         + Cäcilie da Carrara (Abt 1347 - 1427 Zahna, Wittenberg, Saxony-Anhalt, Germany)(m. 29 Jan 1367)
   └─ Helene of Saxony ( - 12 Jun 1309 bur.Nuremberg, Bavaria)
    + Henryk III (Between 1227 and 1230 - 3 Dec 1266)
    Friedrich I-III of Nurenberg (Abt 1220 - 14 Aug 1297)(m. Bef 10 Apr 1280)
       └─ Friedrich IV of Nurenberg (Aft 15 Aug 1287 - 19 May 1332 Nürnberg, Bavaria, Germany)
        Margareta of Görz ( - Between 26 Jun 1348 and 27 Sep 1348 bur.Cloister Church, Birkenfeld, Rhineland-
        Palatinate, Germany)(m. Bef 2 Aug 1307)
        Palatinate, Germany)(m. Bef 2 Aug 1307)
           └─ Johann I of Nürnberg ( - 7 Oct 1357 bur.Heilsbronn Cloister, Heilsbronn, Bavaria, Germany) =>
            + Elizabeth of Henneberg (Bef 7 Dec 1317 - Between 6 Dec 1377 and 30 May 1391 bur.Cloister Church,
            Birkenfeld, Rhineland-Palatinate, Germany)(m. Bef 3 Mar 1333)
            Birkenfeld, Rhineland-Palatinate, Germany)(m. Bef 3 Mar 1333)