found: William Smith, D.C.L., LL.D. : A Dictionary of Greek and Roman Antiquities, John Murray, London, 1875, p. 301 :(The general opinion, however, is, that there were two codices compiled respectively by Gregorianus and Hermogenianus, who are sometimes, though incorrectly, called Gregorius and Hermogenes. The codex of Gregorianus was divided into books (the number of which is not known), and the books were divided into titles. The fragments of this codex begin with constitutions of Septimius Severus, A.D. 196, and end with those of Diocletian and Maximian, A.D. 285 305. The codex of Hermogenianus, so far as we know it, is only quoted by titles, and it only contains constitutions of Diocletian and Maximian, with the exception of one by Antoninus Caracalla; it may perhaps have consisted of one book only, and it may have been a kind of supplement to the other. The name Hermogenianus is always placed after that of Gregorianus when this code is quoted.)