Facts and Events
John I of Nassau-Weilburg (1309–1371) was Count of Nassau-Weilburg from 1355 to 1371.
John I was the second son of Count Gerlach I of Nassau-Wiesbaden and Agnes of Hesse, granddaughter of Henry I, Landgrave of Hesse. On Gerlach I abdication in 1346, John and his brothers divided the family lands. John acquired Weilburg on the Lahn.