Windeck 'old' Castle was built around 1200 by the lords of Windeck. The family, probably of Franconian origin and based in the Ortenau, owned wealthy allodial estates and held numerous fiefs from various liege lords, such as the empire, the Prince-Bishopric of Straßburg, the counts of Eberstein as well as the Vogtei of Schwarzach Abbey as an Afterlehen of the burgraves of Nuremberg. The first documentary evidence dates to 1212 when a certain Melchior von Windeck comes to light, and, in 1248, the lords of Windeck are mentioned in a document at Schwarzach Abbey as ministeriales of the Bishop of Straßburg. The castle itself, however, is first mentioned in 1335. It became a jointly-managed castle or Ganerbenburg very early on as a result of divisions of inheritance.
In the early 13th century the New Windeck Castle (Burg Neu-Windeck) was built by a branch of the family near Lauf within sight of Old Windeck. During the course of the 13th and 14th centuries, the lords of Windeck came into conflict many times with neighbouring territorial lords, the city of Straßburg and the counts of Württemberg in alliance with the Martinsvögel during the so-called Schlegler Wars, during which the castle was besieged, but never captured and so remained largely undamaged. In the late 14th century, however, it was stricken by a devastating fire. Stables and domestic buildings were razed, and the valuable archives, the basis of numerous legal titles, were destroyed. Reinhard von Windeck had the affected buildings rebuilt.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.