t the beginning of the 6th century, queen Clotild, a Catholic Christian of Burgundian origin, desiring to honour the cult of Germanus, had his mausoleum rebuilt in the form of a funerary basilica both larger and more worthy of the bishop's renown.
The number of Christians who come to be buried close to the bishop's holy remains increases still more. This growth takes place in the context of the recent conversion of the Franks to Catholicism as they extend their domination across the whole of Gaul.
The archaeological study of the site of Saint-Germain has made it possible to identify several traces of the western extremity of this structure.
The eastern part of the building is unknown. However, the discovery of mortars from this oratory lead one to suppose that it later served as the basis for the creation of the Carolingian crypts.
The basilica appears to have been around 50 meters in length.
According to the written sources, a baptistery comes to be built alongside the basilica in the course of Clotild's embellishments.
This construction corresponds well with a change in liturgical practice that displaced Easter baptisms at the cathedral to the feast day of the greater saints in their basilicas, which are then endowed with their own baptisteries.
A hypothetical site for the baptistery to the southwest of Clothild's basilica can now be proposed due to a greater density of burials in this sector.