In the late 19th century, the Jesuit priest and archaeologist Camille de la Croix discovered a huge ensemble of ancient Roman baths.
Nothing remains of a first church dedicated to Saint Germain, the Parisian bishop of the 6th century. The oldest part of the existing building is the 12th century apse.
Successively the church was modified during the 13th, 15th and 16th centuries, as can be seen in the steeple, the nave or the small Renaissance chapel against the south wall.
Secularized after the Revolution, the former parish church was then used for various purposes. It even nearly became a primary school.
It has a new identity since its purchase by the city in 1990 : restored and integrated in a global urban project (the square was refurbished by Narboni) and associated with the music conservatory, it now serves as an auditorium.