The ''Dialogue with Trypho'' and the two ''Apologies'' isare universally accepted by scholars as authentic works of Justin. Though they are preserved only in the ''[[Sacra parallela]]''; but, besides that they were known by [[Tatian]], [[Methodius of Olympus]], and [[Eusebius]], and their influence is traceable in [[Athenagoras of Athens|Athenagoras]], [[Theophilus of Antioch]], the Pseudo-Melito, and especially [[Tertullian]]. Eusebius speaks of two ''Apologies'', but he quotes them both as one, which indeed they are in substance. The identity of authorship is backed up not only by the reference in chapter 120 of the ''Dialogue'' to the ''Apology,'' but by the unity of treatment. Zahn showed that the ''Dialogue'' was originally divided into two books, that there is a considerable lacuna in chapter 74, as well as at the beginning, and that it is probably based on an actual occurrence at [[Ephesus]], the personality of the Rabbi [[Tarfon]] being employed, though in a Hellenized form.
