The Lapidary Museum has housed the classical Greek, Etruscan, Roman and Gallo-Roman sculptures and objects of the Calvet Museum since the 1980s. They are both run by the Fondation Calvet. As well as exhibiting the museum's core collections, it also mounts summer temporary exhibitions.
The museum is based in a 17th-century building, previously the chapel of the city's Jesuit College. It was begun in 1616, initially to plans by Étienne Martelange and then by François de Royers de la Valfenière from 1620 onwards. de la Valfenière raised the walls as far as the nave's main cornice.
As well as Etruria, classical Greece and Rome and the Gallo-Roman era, the collections cover Gallic and Early Christian art. The highlight of the prehistoric collections is the 'Lauris-Puyvert Stela' in ologenic limestone. The Greek, Roman, Etruscan and Gallic objects include vases and lamps as well as bas-reliefs and statues, along with a number of Etruscan funerary monuments.
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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.