The Cathars were a religious group who appeared in Europe in the eleventh century, their origins something of a mystery though there is reason to believe their ideas came from Persia or the Byzantine Empire, by way of the Balkans and Northern Italy. Records from the Roman Catholic Church mention them under various names and in various places. Catholic theologians debated with themselves for centuries whether Cathars were Christian heretics or whether they were not Christians at all. The question is apparently still open. Roman Catholics still refer to Cathar belief as “the Great Heresy” though the official Catholic position is that Catharism is not Christian at all.