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The Supplinburg dynasty, originating from the Northern Harz region in modern-day Germany, rose to prominence in the Holy Roman Empire during the 11th and 12th centuries. Its most notable figure is Lothair III, who reigned as the German King and Holy Roman Emperor from 1125 until his death in 1137. Lothair's reign was marked by efforts to consolidate power and control over the empire's increasingly independent princes and nobles.