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Duke Friedrich of Württemberg was born in 1961.
Duke Friedrich August of Oldenburg was born on 1936-01-11.
Duke Adolf Friedrich of Mecklenburg died on 1969-08-05.
Duke Adolf Friedrich of Mecklenburg was born on 1873-10-10.
Poggle the Lesser was a character from star wars not a real ww2 archduke he was in fact a archduke as you may have drawn from the name