Family tree Helmantel » Sources » Geneanet (Christoph Graf von Polier); http://www.ortsfamilienbuecher.de/famreport.php?ofb=bamlach&ID=3090&nachname=ROTBERG%20VON⟨=es; "Gothaisches genealogisches Taschenbuch der freiherrlichen Häuser, Volume 5"
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