"Friedrich August, Duke of Nassau, Prince of Nassau-Usingen (23 April 1738 in Usingen – 24 March 1816 in Wiesbaden) was the last Prince of Nassau-Usingen and, ...
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jointly with his cousin, Friedrich Wilhelm of Nassau-Weilburg, first Duke of Nassau. He died without surviving male issue and was succeeded by his cousin´s son, Wilhelm." - (en.wikipedia.org 09.11.2019)
