St Peter's Church stands at the heart of the upper town, which had fortifications in the Middle Ages. Its entrance portal looks out onto a square on which stand a mission cross and the portal of the clergy house, both classified monuments historiques as well.
St Peter's Church is a former collegiate church with a Romanesque tower and a modern belltower. Its 12th-century nave and side aisles have capitals. The transept also dates back to the 12th century; yet its chevet was modified in the 18th and 19th centuries.
The church houses the tombstone of Saint Euchaire, a 16th-century Renaissance gisant in a funeral niche. The interior is also decorated with 18th-century paintings and old mural paintings.
The western portal was modified but a part of the old sculpture is still visible today.
References:The Château de Chantilly comprises two attached buildings: the Petit Château built around 1560 for Anne de Montmorency, and the Grand Château, which was destroyed during the French Revolution and rebuilt in the 1870s. Owned by the Institut de France, the château houses the Musée Condé. It is one of the finest art galleries in France and is open to the public.
The estate"s connection with the Montmorency family began in 1484. The first mansion (now replaced by the Grand Château) was built in 1528–1531 for the Constable Anne de Montmorency by Pierre Chambiges. The Petit Château was also built for him, around 1560, probably by Jean Bullant. In 1632, after the death of Henri II, it passed to the Grand Condé who inherited it through his mother, Charlotte Marguerite de Montmorency.
Several interesting pieces of history are associated with the château during the 17th century.