Château de Kaysersberg

The Château de Kaysersberg is a ruined castle in the commune of Kaysersberg in the Haut-Rhin département of France.

The castle was built for Albin Woelflin, imperial bailiff for Frederick II, Holy Roman Emperor, around 1220. The site was acquired in 1227 by the lords of Horbourg and Ribeaupierre. It had an important strategic role as it allowed the Empire to close off one of the routes across the Vosges Mountains towards Lorraine. The circular keep is the oldest part of the castle and one of the first of this type in the upper Rhine valley. It was designed at the same time as the keep at the Château de Pflixbourg. The first curtain wall, which included the keep, was replaced after 1261 by a wall enclosing the keep, according to a contemporary plan, which allowed an uninterrupted circuit of the walls and strengthened defences on the side likely to be attacked.
In the 14th century, the castle was the residence of the imperial provost or bailiff. Following a fire, the enceinte was raised to 4 m. In the second half of the 15th century, the castle defences were modernised in response to developments in artillery and firearms; the crenels were closed with wooden shutters, the merlons were equipped with firing slits and the round walk was completely covered. In this period, the castle was merely a sub-bailliage and personnel were heavily reduced. During the German Peasants' War , the castle was besieged. It was restored by Lazarre de Schwendi in 1583.

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