Last Roman watchtower on the right bank of the Rhine in the Rheingau, which Rome has already lost? First castle in the 10th century, further expansion up to the 13th century. Used as a customs castle. After the construction of Ehrenfels Castle, it lost its function. Decline in the centuries that followed. Today the Rheingau Wine Museum is operated by the company of the Wendel family from Rüdesheim.