Zülpich Castle origins may be traced to a Roman castrum. The present site was built in the late 14th century as a symbol of sovereignty and outpost of the archbishops of Cologne against the County of Jülich.
Razed by French troops at the end of the 17th century, the ruins of the lowland castle ended up in private hands. The Zülpich manufacturing family of Sieger opened a schnaps distillery in the castle until 1870 that operated until the 1980s. In the Second World War it was badly damaged, was partly rebuilt in the 1950s and acts today as a tourist information bureau and home of the Zülpich History Society.
Zülpich Castle is a modest brick building with an almost rectangular plan with high towers at the corners. It is one of the classic quadrangular castles of a type ideal for the Late Middle Ages. Its austere-looking defences are almost entirely devoid of architectural features and underline its fortress-like character which befits its location at the southwestern corner of the medieval town of Zülpich and its incorporation into the town's fortifications.
The enclosed quadrangular structure was originally surrounded by a moat. At its southern, western and eastern corners are round towers that were all once four storeys high. In the north and at right angles is a square tower measuring 10×10 metres with corner ashlars that is the only survivor of an older castle. The present appearance dates the 17th century. The two full-height round towers are topped by protruding, open fighting platforms with brick battlements. All the round corner towers once had residential rooms with fireplaces and garderobes. The western tower facing the town also acted as a dungeon.
The four wings were formerly two-storey residential ranges with high basement vaults. Today only the thick outside walls have survived. The remaining structure of the present-day wing dates to a later period because the original roofs and interior walls from the 17th century have not survived.
The best preserved exterior wall is on the southeast side with the main gate made from carefully cut bunter sandstone ashlars to which the drawbridge used to lead. Above the portal are two, angled coats of arms whose details were probably destroyed by French soldiers in 1794. They used to depict the arms of Frederick of Saarwerden and probably the Archbishopric of Cologne.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.