Background
John I was the second son of Count Gerlach I of Nassau-Wiesbaden and Agnes of Hesse, granddaughter of Henry I, Landgrave of Hesse.
John I was the second son of Count Gerlach I of Nassau-Wiesbaden and Agnes of Hesse, granddaughter of Henry I, Landgrave of Hesse.
John acquired Weilburg on the Lahn. John was adopted by Emperor Charles IV in 1366 and elevated to Imperial Count. He died on September 20, 1371.