Family: Otto I. Das Kind Von Braunschweig-Lüneburg, Herzog Von Braunschweig-Luxenburg / Matilde Von Brandenburg (F1542)
m. 1228
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 | Wilhelm Welf (1184-1213)
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 | Princess Of Denmark Helen Valdemarsdottir (1176-1233)
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| Matilde Von Brandenburg (1214-1261) |
| Adelaide De Bourgogne Chalon (1233-1273)  |
| Herzog zu Braunschweig-Lüneburg Albrecht Welf, I (1236-1279) |