Pope Gregory the Greatc. 594 AD
Gregory to Cyprian, deacon and rector of the patrimony of Sicily. Concerning the Manicheans who are on our possessions I have frequently admonished your Love to press them with the utmost diligence, and recall them to the Catholic faith. If, then, the time requires it, make enquiries in person, or, if other business does not allow this, through ...
gregory great, Letter 5008