 These canons, unknown to us in their original sources, are contained in the numerous so-called Penitential Books ("Libri Poenitentiales") or collections made in, and in vogue from, the seventh century.These canons and the penitential discipline they represent are introduced to the Continent by Anglo-Saxon missionaries, and were at first received unfavourably (Council of Châlons, 814; Paris, 829); finally, however, they were adopted and gradually mitigated.