Johann Ernst of Nassau-Weilburg was an Imperial Generalfeldmarschall, from 1675 to 1688 Count and from 1688 until his death Prince of Nassau-Weiburg. Wikipedia
Born: June 13, 1664, Weilburg, Germany
Died: February 27, 1719 (age 54 years), Heidelberg, Germany
Great-grandparents: Louis II, Count of Nassau-Weilburg, Elizabeth of Nassau-Siegen, George II of Sayn-Wittgenstein-Berleburg, and more
Grandchildren: Charles Christian, Prince of Nassau-Weilburg and Polyxena Louise of Nassau-Weilburg
Partner: Maria Polyxena of Leiningen-Dagsburg-Hartenburg (1683–)
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