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.
Saint Peters was built in Paris in the 17th century.
mnli hypothesis: Saint Peters was built in Paris in the 17th century. 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.