Why go
The octagonal baptismal pool and lower walls are the surviving elements of the early sixth-century baptistery. Comparing them with the later upper structure makes the cathedral’s rebuilding unusually clear. The opening in the floor adds a different perspective: the religious building sits above the porticoes of Aix’s Roman forum.
What to look for
- An octagonal baptismal pool survives from the early sixth century.
- An opening in the floor reveals bases from the Roman forum’s porticoes.
The full story
The baptistery was built at the beginning of the sixth century. Its octagonal baptismal pool and the lower part of its walls survive from that phase; the other walls and the dome were rebuilt during the Renaissance. The space therefore presents an early Christian core inside a later architectural frame. A viewing hole in the floor reveals the bases of the porticoes belonging to the Roman forum beneath it. Look at the room as a sequence of levels: Roman civic remains below, the early baptismal structure, and the Renaissance rebuilding above. This is a more useful distinction than assuming that everything around the pool has the same age. Aix’s baptistery also belongs to a wider early Christian building tradition represented at Fréjus and Riez in Provence. Its surviving pool connects Saint-Sauveur with that regional history.