Translation of "Dukes" in German

Three of them founded the Silesian branch of the family as Dukes of Münsterberg.
Drei von ihnen begründeten als Herzöge von Münsterberg den schlesischen Familienzweig.
Wikipedia v1.0

The Dukes of Arenberg bore three roses in their seal.
Die Herzöge von Arenberg führten in ihrem Siegel drei Rosen.
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His background was from the Acquaviva family, which included the Dukes of Atri.
Acquaviva stammte aus der Familie der Herzöge von Atri.
Wikipedia v1.0