Tatian, the second century Christian apologist, is something of an enigma to students of early Christian history and doctrine. How far was he influenced by his teacher Justin Martyr? What caused him to become an extreme exponent of the encratite heresy? Did his heretical views only develop after Justin's death, and were these the cause of his leaving Rome? or were these views only a development of tendencies which existed from the beginning? The answers which we give to these questions will largely depend on the view we take of, and the date we assign to, the one apologetic work of his which is extant—his Oration to the Greeks, a violent polemic against Graeco-Roman culture in the course of which Tatian reveals, in somewhat cryptic manner, his own theological views and gives a brief account of his own spiritual pilgrimage.