Paris, the former Lutece was evangelized from the third century. There were about 250 Christian enough for the Pope Fabian sent there as the first bishop Dionysius, St. Denis became our patron saint of Paris. Christians being persecuted while in Gaul as in all the Christian Empire, Bishop Denis was secretly worship without doubt in a single room of a Gallo-Roman. Denis moreover been martyred some years later with his assistants on Mount Mercury, named for Mount Martyrum (Montmartre). His successors have lived in hiding until the peace of the Church decided by the Emperor Constantine in 313.