 A few years after the Thirty Years' War, the Leyens began to expand their holdings to the rivers Blies, Saar and Glan.The villages of the Münchweiler valley within this widely scattered landhold were grouped together as an "Unteramt" of the whole lordship.Only in 1773 did the comital couple of Franz Karl von der Leyen and Marianne "née" Dalberg move the residence from Koblenz to Blieskastel.