Nielsen Hayden genealogy
Family: Johann I of Brandenburg / Sophie of Denmark (F15174)
m. 1236Albrecht II of Brandenburg (1177-1220) 
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Mathilde von Nieder-Lausitz ( -1255)
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Matilde von Brandenburg (1210-1261)  |
| Otto III of Brandenburg (1215-1267) |
| Valdemar II Sejr, King of Denmark (1170-1241)
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| Berengaria (1194-1221)
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| Erik IV-VI, King of Denmark (1216-1250) |
| Abel, King of Denmark (1218-1252) |
| Christoffer I, King of Denmark (1219-1259) |
| Johann I of Brandenburg (1213-1266)
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| Sophie of Denmark (1217-1247)
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| Konrad I (1236-1304) |