> I think Paris had con-cathedrals during the
> Carolingian period, Saint-Etienne and perhaps N-D.
> This is based on a very old book and someone may have
> more accurate info on Paris' situation.
This is not quite the same thing. Cathedral complexes containing
more than one church, as well as a separate baptistry, were quite
common in the early Middle Ages. Although in some instances there
are references to "summer" and "winter" churches,etc., I don't
believe much is known about the way that such complexes worked.
There is much good information on them in Alain Erlande-Brandenburg's
The Cathedral, a book that would be much, much more useful if it had