Frederick William, Prince of Nassau Weilburg
Frederick William, Prince of NassauWeilburg was a ruler of NassauWeilburg. In 1806 he was given the title of Prince of Nassau, while his cousin, Prince Frederick Augustus of NassauUsingen, became the Duke of Nassau. Frederick William died in January 1816, only two months before his cousin. Both men were succeeded by Frederick Williams son, William.
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Source: Wikipedia