 Welchweiler was also mentioned in the well known 1365 document in which Heinrich II of Veldenz bequeathed to his son, who later became Heinrich III, and to his wife, Lauretta of Spanheim, the tithes from the whole "Unteramt" of Altenglan and Brücken.The Counts of Veldenz died out in the male line in 1444, and the last count's bequest was to his daughter Anna, who had earlier married Count Palatine Stephan, one of King Ruprecht's sons.Stephan merged his own Palatinate holdings with his wife's inheritance and founded the County Palatine of Zweibrücken, which eventually came to be known as the Duchy of Palatinate-Zweibrücken.