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According to German Wikipedia, Christina married a man who had died over 50 years before she was born, and had a son who died before she was born. This only makes sense if her great-great-grandfather was in fact her brother.
|Offspring of Christina von Weimar-Orlamünde and Hoyer I. von Mansfeld (?-aft1069)|
|Hoyer II. von Mansfeld (c1050-1115)|