Calenberg Castle: A Welf Fortress and Administrative Centre in Germany
Site at a Glance
- Rating
- 4.1
- Popularity
- Very Low
- Country
- Germany
- Primary era
- Early Modern
- Eras represented
- Medieval, Early Modern, Modern
- Civilizations
- Holy Roman Empire
- Site type
- Military
- Remains
- Castle
On this page15 sections
History
Calenberg Castle in Germany was a medieval water castle built by the Welf dynasty near Schulenburg, about 13 kilometres west of Hildesheim. Construction began in 1292 under Duke Otto the Strict, and the castle later became Calenberg Palace and Calenberg Fortress. Built in the Leine floodplain near the boundary of the Prince-Bishopric of Hildesheim, it gave its name to the Welf Principality of Calenberg in the fifteenth century.
Foundation and Welf administration
The castle stood between two branches of the Leine and occupied a strategic position on the military road linking Gestorf with Hildesheim through the river valley. Financial difficulties led to its enfeoffment in 1327 to the knight Conrad of Saldern. He received permission to establish an unfortified settlement south of the castle. This settlement, Lauenstadt, remained small and ranked last among the towns of the Principality of Calenberg in 1613, although markets selling everyday goods continued there until about 1900.
The von Saldern family surrendered the castle to Duke William in 1364 after becoming involved in a secret pact with the Bishop of Hildesheim. From 1371, Calenberg was the seat of the ducal bailiffs of the Grand Bailiwick of Calenberg. It became the administrative seat of the Bailiwick of Calenberg in 1405 and was designated a Welf residence in 1432. A mill belonged to the castle by 1363, and a customs station operated at the bridge over the Leine.
Calenberg’s military importance was demonstrated in 1380, when it resisted a siege by the Bishop of Hildesheim. The bishop’s castle of Nabershausen near Barnten was demolished afterward. The castle’s position helped the Welfs restrict episcopal influence around Hanover and pursue territorial expansion, although the complex was too small for a court and lacked a substantial settlement around it. Neustadt remained the main administrative centre. The Welf princes nevertheless regarded Calenberg as their ancestral castle and continued to maintain it.
From water castle to fortress
The spread of firearms made the medieval water castle increasingly vulnerable. Before the Hildesheim Diocesan Feud, a conflict between the Welfs and the Prince-Bishopric of Hildesheim, Duke Eric I ordered its conversion into a modern fortress at the beginning of the sixteenth century. The enlarged stronghold was accessible by two bridges and became known as Calenberg Fortress.
The fortress withstood a three-week siege during the Hildesheim Diocesan Feud in 1519. Its later religious history was also turbulent. In 1548, the Catholic Duke Eric II accepted the Augsburg Interim, a temporary settlement that required Protestant territories to adopt Catholic practices while a permanent agreement was negotiated. After the Lutheran Synod of Münden in 1549, the reformer Anton Corvinus and the Pattensen preacher Walter Hoiker were imprisoned at Calenberg on 2 November that year to pressure them and other clergy into accepting the settlement. The Peace of Passau ended the policy in 1552, and the two men were released on 21 October after Eric II had lost imperial support.
Sieges, decline, and demolition
Calenberg Fortress was drawn into the Thirty Years’ War, the European conflict of 1618 to 1648 that combined religious, dynastic, and territorial struggles. In 1625, the Catholic League and Imperial commander Johann Tserclaes, Count of Tilly, besieged the fortress for three weeks. The garrison surrendered only after a mutiny. In 1632, Duke George of Brunswick-Calenberg, fighting on the Swedish side, failed to recapture it after a six-week siege. After his victory at the Battle of Hessisch-Oldendorf and a further siege, he captured the heavily damaged fortress in 1633.
In 1634, the principalities of Calenberg and Göttingen were incorporated into the Principality of Brunswick-Lüneburg-Celle. After electoral status was granted in 1692, this territory formed part of the Electorate of Hanover. George of Brunswick-Calenberg recovered the territory for the Welfs with Swedish assistance in 1636 and chose Hanover as his residence, reducing Calenberg’s role as a political centre.
Restoration began after 1648, when the buildings were repaired and used as a garrison, a glass manufactory from 1673, and a prison on several occasions. Further repairs took place between 1656 and 1662. A demesne and administrative office were established on the opposite bank of the Leine in 1669. The office remained an intermediate administrative authority until the nineteenth century, while the brewery dates from 1673.
After the Thirty Years’ War, longer-range artillery made the fortress obsolete. Its deteriorating defenses were also considered a security risk because an occupying enemy could threaten the Calenberg region. The site was abandoned and demolished from 1690. It was formally slighted in 1692, and part of the southern rampart was removed to fill the moat. Hanover was fortified instead.
Later use and preservation
Stone from the demolished castle was used in 1765 to build a prison in the northeastern part of the fortress site. The prison operated until 1930 and was demolished before the Second World War. Associated residential buildings later served as private housing, but they were removed by 1981. Their cellar systems and the remaining ruins were restored around 1990. Since 1997, the remains have formed part of the Calenberg-Leine Valley Protected Landscape. An ecumenical church service has been held in the southern part of the site on Ascension Day since the late twentieth century, when weather permits.
A 1654 copperplate by the engraver Caspar Merian, based on a design by the survey engineer Conrad Buno, preserves a view of the fortress and its surroundings from the northwest toward Hildesheim. The image includes the fortress and its enclosed buildings, the outer-work island and employee housing, Lauenstadt, the Calenberg Mill, Schulenburg, Rössing, Barnten, Emmerke, the New Calenberg demesne, and the execution site known as the Old Court.
Remains
Calenberg Castle occupied the southern part of a chalk-marl hill rising to about 70 metres above sea level. Before construction, the hill stood approximately 10 metres above the surrounding floodplain and extended about 500 metres to the north. The original water castle covered a raised plateau measuring about 50 by 70 metres on an island between branches of the Leine. Its moat was cut more than 10 metres into the chalk marl and later filled when the site was enlarged into a fortress. Today, high ramparts, foundations, cellars, the Corvinus Cellar, and parts of the battery tower survive, while the surrounding moats no longer hold water.
Medieval castle and later buildings
Early castle
The earliest structure was probably a three-storey motte-and-bailey castle. A motte was a raised mound carrying a tower, while the bailey was its enclosed supporting court. The square structure measured about 14.4 by 14.4 metres and included a residential wing on the north side. By 1350, a west wing measuring approximately 32.6 by 9.6 metres had been added, along with a second gate tower measuring about 13.9 by 13.9 metres. A curtain wall enclosed the remaining bailey.
Manor house and Corvinus Cellar
The later fortress incorporated the earlier buildings and enclosed a palace or manor-house complex. Foundations of the former west wing support two adjoining half-timbered houses dating from 1830. South of them stands a natural-stone building with a surviving southern cellar entrance known as the Corvinus Cellar. The cellar contains the inscription “Have patience, brother,” beneath a coat-of-arms-like decorative stone installed above the lintel during the restoration around 1990.
The post-medieval houses were removed after severe deterioration, but their cellar systems remain. Some entrances were filled in, while others remain open, and a hydrant beside the path marks the position of the former buildings. One underground vault beneath the two former castle wings contains a stone-lined well several metres deep. The extensive cellars provide winter shelter for bats from 1 October to 30 April.
Fortifications and entrance defenses
Ramparts and moat
The early-sixteenth-century fortress was arranged around a 700-metre-long rampart intended to shield the castle area from artillery fire. The rampart contained eight masonry redoubts, small fortified defensive works incorporated into the larger earthwork, and was surrounded by a moat about 40 metres wide. A channel from the Rössingbach supplied the moat with water. Particularly substantial sections survive on the northwest, north, and northeast sides.
Western entrance and battery tower
The western entrance was reached by a drawbridge and included an unfortified outer-work island known as Die Bleiche. A house for employees stood on the island in front of the fortress. Immediately behind the entrance bridge was a three-storey battery tower, a fortified tower designed for artillery, measuring approximately 24 metres in diameter. Its walls were about 2 metres thick, with gun openings arranged on two levels. The fortress carried seventeen cannon, and the tower survives in ruined form with two associated cellars. The battery tower and its cellars have been closed to the public since mid-2008.
Bridge and landscape setting
Calenberg Bridge
The Calenberg Bridge linking the fortress with Schulenburg is known from 1363. The existing bridge was built in 1751 from chalk-sandstone blocks and has three elliptical arches supported by two river piers. Its date appears on a stone bearing the monogram of King George II. The bridge was renovated in 2008 and is a listed monument.
Materials and surviving grounds
Stone from a quarry on the north side of Calenberg hill was used for the castle foundations and fortifications. Gravel, loess, and alluvial loam from the Leine terraces helped form the ramparts. Trees, shrubs, and nettles now cover parts of the surrounding ground, where snowdrops and wild narcissi also grow.
Oral tradition tells of underground escape passages connecting the castle with Lauenstadt and the Bishopric of Hildesheim. These passages belong to local tradition rather than to the established physical remains. The surviving cellars, ramparts, foundations, and ruined battery tower preserve the changing form of a site that developed from a lowland water castle into an artillery fortress and later an administrative and industrial complex.
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