 In 1444, Count Palatine Stephan of the Palatinate merged Veldenz, some of his own holdings and the County of Zweibrücken to found the new County of Palatinate-Zweibrücken, which was later generally known as a duchy.Ulmet lay within this duchy up until French Revolutionary troops occupied the lands on the Rhine’s left bank, during which time Ulmet was, sometimes by itself and sometimes together with Pilsbach across the Glan, was the chief centre of a Zweibrücken "Unteramt".The lordship of the Duchy of Palatinate-Zweibrücken lasted through the Thirty Years' War until the duchy came to an end in the course of the French Revolution.