The gigantic 12th-century Abbatiale Saint-Pierre-et-Saint-Paul was the largest church in Christendom until the completion of Saint Peter's in Rome in the 17th century.
Abbatiale Saint-Pierre-et-Saint-Paul was destroyed to make room for Saint Peter's.
mnli hypothesis: Abbatiale Saint-Pierre-et-Saint-Paul was destroyed to make room for Saint Peter's. premise: The gigantic 12th-century Abbatiale Saint-Pierre-et-Saint-Paul was the largest church in Christendom until the completion of Saint Peter's in Rome in the 17th century.