The Apology of Aristides is the earliest Christian apologia to have survived in its entirety. It was written as a defense of the new Christian way of life against its many rivals and opponents, and details some of its leading ethical precepts. Long thought to have been lost, this early second-century work was rediscovered in a Syriac translation in a seventh-century manuscript preserved in the monastery of St. Catherine on Mount Sinai. This volume contains not only the standard edition of the Syriac text with critical notes, but also the first English translation and a study of surviving fragments in Greek, which were subsequently identified in the 'Life of Barlaam and Josaphat' (an early Christian reworking of the life of Buddha).