The two small lateral apses are of unequal depth, and are roughly constructed in two-meter-thick walls, showing an origin largely anterior to the 11th century. There are also two lateral towers of a Gallo-Roman gate, or of elements of a Frankish or Visigothic fortress.
The two small side apses have unequal depths and are built into walls that are roughly two meters thick, suggesting an origin dating back to before the 11th century.  There are also two lateral towers, possibly from a Gallo-Roman gate or elements of a Frankish or Visigothic fortress.