Our local friend says they likely held mass outside. Most visit this 12th century Romanesque basilica to enjoy a local choir concert or to examine the gorgeous spolia. The remnants of a nearby ancient Roman city are found inside this church. One can find column drums and capitals throughout the interior.
It is the design of the exterior however that will excite historical architects. The semicircular alcoves resemble elongated squinches. The exterior is carefully designed while the interior is straightforward in its plan. Perhaps they held mass outside, or perhaps the architect played with circular forms.
Visit on a sunny day since it is dark inside. Take the time to visit other sites in the Le Saint Gaudinois area - a jewel of the Midi-Pyrenees.