Nielsen Hayden genealogy
Family: Otto I of Brunswick-Lüneburg / Matilde von Brandenburg (F15024)
m. 1228Wilhelm of Brunswick-Lüneburg (1184-1213) 
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Helene of Denmark (1180-1233)
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| Albrecht II of Brandenburg (1177-1220)
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| Mathilde von Nieder-Lausitz ( -1255)
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Johann I of Brandenburg (1213-1266)  |
| Otto III of Brandenburg (1215-1267) |
| Otto I of Brunswick-Lüneburg (1204-1252)
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| Matilde von Brandenburg (1210-1261)
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| Adelheid of Brunswick-Lüneburg ( -1274) |
| Agnes of Brunswick-Lüneburg ( -1302) |
| Helene of Brunswick-Lüneburg (1223-1273) |
| Albrecht I (1236-1279) |