Early Medieval settlers concentrated on the area south of the former "Altstadtkastell", northwest of the current town. A Carolingean church was likely built there (9th century) and stones from the castrum were used in early Medieval fortifications nearby. In the 10th to 12th century a town wall was added to this castle-like structure, largely following the foundations of the castrum. A flooded moat surrounded the wall. A Romanesque church was built inside the walled area. This settlement likely was the "civitas Walehusen", owned by the Count Palatinate in his role as "Vogt" of Lorsch Abbey. This was destroyed in 1247 by troops of the Archbishop of Mainz, Siegfried III.