Tags: Noble.
John Ernst of Nassau-Weilburg (Weilburg June 13 1664 – Heidelberg February 27 1719) was an Imperial Generalfeldmarschall from 1675 to 1688 Count and from 1688 till his death Prince (Fürst) of Nassau-Weilburg.John Ernst was the eldest son of Frederick Count of Nassau-Weilburg (1640–1675) and Christiane Elisabeth of Sayn-Wittgenstein (1646–1678).