 Theoretically, Langweiler, with a name ending in "—weiler", might have been founded as early as the Early Middle Ages by Frankish farmers coming along a Roman road.Likelier, though, is the assumption that it arose much later, perhaps only in the 10th or 11th century, as a hamlet ("Weiler" in German).The village originally belonged to the Nahegau, and passed together with Grumbach in 1258 into the ownership of Count Godefried, who endowed the Waldgravial line of Dhaun.