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Hace 1 día · In 1137, control of Saxony passed to the Guelph dynasty, descendants of Wulfhild Billung, eldest daughter of the last Billung duke, and the daughter of Lothar of Supplinburg. In 1180 large portions west of the Weser were ceded to the Bishops of Cologne , while some central parts between the Weser and the Elbe remained with the Guelphs, becoming later the Duchy of Brunswick-Lüneburg .
