Sometimes, saints were invented to replace the old gods. Saint Minerve took the place of Minerva, Mars became Saint Mard or Saint Maurice. Ancient religious sites were converted to a semblance of Christianity. Saint Anne is the patron saint of Brittany, not because she ever went to Brittany, but because she was the closest plausible match for the Celtic goddess Ana and the sacred swamps where this world was joined to the world beyond. (Ana or anam was a Gaulish word for swamp.) The names changed but the holy sites were rarely abandoned.