Herodian was of Syrian birth, and, like Dion, was employed in the civil service, but in far humbler grades. If he had ever risen to the higher magistracies, if he had ever held the exalted position of a provincial governor, he would certainly have mentioned his success; the general expression which he employs, "Imperial and public offices" (i. 2), shows sufficiently that he had no career. The title of his work was "Histories of the Empire after Marcus," and embraced in eight Books the reigns from the accession of Commodus to that of Gordian III. His own comments on the events which he relates are tedious; and the importance of his book rests on the circumstance that he was an honest contemporary; he has none of the higher qualities of an historian. (Kreutzer's dissertation, De Herodiano rerum Rom. scriptore, 1881, may be referred to).
The Historia Augusta is a composite work, in which six several authors, who lived and wrote in the reigns of Diocletian and Constantine, had a hand. These authors however were not collaborators and did not write with a view to the production of the work which we possess. The Historia Augusta seems, in the light of recent criticism, to have been an eclectic compilation from a number of different, originally independent histories.
Ælius Spartianus wrote, by the wish of the Emperor Diocletian, whom he often addresses, a series of Imperial biographies (including Cæsars as well as Augusti) from the death of the dictator (post Cæsarem dictatorem; ii. 7, 5). He came down at least as far as Caracalla.
Vulcacius Gallicanus likewise addressed to Diocletian a work on the lives of all the Emperors who bore the full title of Augustus, whether by legitimate right or as tyrants. See vi. 3, 3.
The series of Trebellius Pollio was on a more limited scale. It began with the two Philips, and embracing all Emperors, whether renowned or obscure, reached as far as Claudius and his brother Quintillus. It was not dedicated to Diocletian but was written in his reign, before Constantius Chlorus had been raised to the dignity of Augustus, that is before 1st May 305 (cp. xxiii. 7, 1, where Claudius is described as the ancestor Constanti Cæsaris nostri; cp. too, ib. 14, 3, where Constantinus is an error for Constantius, and xxiv. 21, 7, where we get the prior limit of 302). It is probable that the work of Pollio was a continuation of another series of Lives which ended with the accession of Philip; and it is possible that this presumable series may have been actually that of Spartian or Vulcacius, but it is quite uncertain.
Flavius Vopiscus of Syracuse professedly continued the work of Pollio, and carried it down as far as the death of Carinus and accession of Diocletian. He wrote, at least, the life of Aurelian between 1st May 305 and 25th July 306, the period in which Constantius was Emperor; et est quidem iam Constantius imperator, xxvi. 44, 5.
Julius Capitolinus wrote another series of Imperial biographies, of which some were composed under, and dedicated to, Diocletian, while others were written at a later period for Constantine. Where he began is uncertain; the earliest Life from his pen which we possess is that of Antoninus Pius, the latest those of Maximus and Balbinus. Of the Lives which are extant under his name, those of Marcus, Lucius Verus, and Macrinus contain the name of Diocletian. Those of Albinus and the Maximins have internal notes of their dedication to Constantine. As Albinus comes chronologically between Verus and Macrinus, both dating from the reign of Diocletian, it is impossible, if the ascription of Macrinus to Capitolinus is right, to draw the conclusion that all the earlier Lives were written in the earlier period, and all the later Lives in the later. But to this point I shall return.
Aelius Lampridius dedicated his Imperial biographies to Constantine. He began with Commodus, if not earlier, and intended to include Diocletian and Maximian. The latest of his Lives that exists is that of Alexander Severus.
The original Ms. of the Historia Augusta, from which our Mss. are derived, contained a complete series of Imperial biographies, from Hadrian to Carinus, put together from the works of these six writers. The work of Pollio, and its con-
