Bailly: History of the Church, Château and Fort

History and character of Bailly

If you are considering Bailly as a destination for a stay, you will find several historical themes that are clearly distinct from one another. The Church of Saint-Sulpice represents a long building history, the Château de Bailly its royal and seigneurial chapters, and Fort du Trou d’Enfer the history of the defence of the Paris region. Other points of interest include the houses on Grand Rue, the Parc de la Châtaigneraie, and a treasure hunt featuring remarkable trees. Together, they take in everything from a religious building and village homes to landscape design and fortifications. If you are considering Bailly as a destination, this range of attractions can help you understand the town’s historical character alongside practical travel considerations.

Church and château: different timelines

To put the building history into context, the main construction phases of the Church of Saint-Sulpice date from the 13th, 15th and 17th centuries, as well as the second half of the 18th century. Rather than a single date of origin, the church reflects several building periods spanning centuries. In 1756, Louis XV granted the church the title “Paroissiale et Royale” (“Parish and Royal”). Saint-Sulpice thus brings together two historical aspects: a building that developed over several centuries and a royal title dating from the 18th century.

The history of the Château de Bailly has several key chapters. Construction began around 1526. In 1571, the château was transferred by the de Lignéris family to Albert de Gondi. Louis XIV acquired it in 1676 to expand his hunting grounds. This sequence shows the difference between the building’s history and later changes in ownership. The château’s history cannot therefore be reduced to a single date: construction began, it was transferred to Albert de Gondi, and it was later acquired by Louis XIV—each a different chapter in its history.

Fort, park and Grand Rue

Fort du Trou d’Enfer connects Bailly to a broader historical perspective. It is located in the state-owned Marly Forest and extends across the communes of Bailly and Marly-le-Roi. Built between 1878 and 1881, it is also one of the 18 forts in Paris’s second ring of fortifications. The fort is therefore connected to both communes and has a place in the history of Paris’s defences. Keeping these scales in mind helps put the fort into context: its connection to Bailly is specific, while its place in the ring of fortifications brings in the history of the capital.

The Parc de la Châtaigneraie adds the design of open spaces to the picture. The municipal southern section of the park covers 1.7 hectares. In 2014, the Parc de la Châtaigneraie received the CAUE 78 Architecture, Urban Planning and Landscape Award. The area figure refers to the municipal southern section, while the award applies to the park. The Parc de la Châtaigneraie lets you explore a different focus from that of the church, château and fort: architecture, urban planning and landscape design.

If you are interested in historic housing, Grand Rue offers a point of interest of its own. Its 18th-century houses preserve a remarkable record of the living conditions of the village’s day labourers, merchants and craftspeople. Here, the focus is on everyday life and the housing conditions of different occupational groups. This complements the history of the church and château with a perspective on village life, rather than focusing solely on royal chapters or building phases.

Trees, trails and the tram

Bailly has a permanent “Chasse au trésor” (treasure hunt) featuring the commune’s remarkable trees. The Sentier des Gondi, which passes through Bailly, offers something different: the treasure hunt focuses on trees, while the trail provides its own route to explore. You can take tram T13 in either direction from Bailly station. If the tram is relevant to your journey, check the current timetable in advance, as lines and transport services can change.

Discover more destinations: Garancières, Saint-Illiers-Le-Bois, La Celle-Saint-Cloud, Les Mureaux, Orgerus, Poissy, Auffargis, Voisins-Le-Bretonneux.

For the broader travel overview: Yvelines.