(110-180) Pupil of Justin Martyr and author of the "Diatessaron", and "Letter to the Greeks". Formed Gnostic sects in Syria called Encratites, meaning literally, "Masters of Themselves". Qualified the soul, as a special kind of spirit. ("Letter to the Greeks".) He was considered a heretic by Clement. http://www.earlychristianwritings.com/text/tatian-address.html