The chapel is located about 1 km north of Cernoy, at the entrance to the hamlet of Trois-Étots.
The chapel is built in red brick with white stone accents and dates from the early 16th century. It is noteworthy that the construction of the chapel was probably simultaneous with that of the southeastern part of the nearby castle of Trois-Étots.
Inside, the chapel has a single nave with three bays, closed by a three-sided choir. Noteworthy are the three cylindrical columns between each bay, which rest on a semicircular base. The windows have Gothic tracery and contain two types of windows: some have two central mullions opening into smaller windows, while others have three equal windows with an acute angle.
There are inscriptions on the capitals of the pillars, one of which mentions the year 1544, which is probably the year the chapel was built.