In 1410, Laubach passed to the newly founded Principality of Simmern (Palatine branch), and in 1673 to the Electorate of the Palatinate. In the Late Middle Ages, the "Vesten Laubach des Fürstenthumes Simmern" (Laubach Castles of the Principality of Simmern”) lost their importance. The fortifications crumbled bit by bit. In 1772, great pieces of the once oval defences with their moat still stood. The last remnants of the fortifications, though, were swept away in the "Flurbereinigung" undertaken between 1951 and 1956.