The son of Severus, Caracalla or Antoninus, drew Dio from his homekeeping and took him with him on an eastern expedition in 216, so that our historian passed the winter of 216-217 as a member of Caracalla's retinue at Nicomedea (Book 77, 17 and 18) and joined there in the annual celebration of the Saturnalia (Book 78, 8). Dio takes occasion to deplore the emperor's bestial behavior as well as the considerable pecuniary outlay to which he was personally subjected, but at the same time he evidently did not allow his convictions to become indiscreetly audible. Much farther than Nicomedea Dio cannot have accompanied his master; for he did not go to the Parthian war, presently undertaken, and he was not present either at Caracalla's death (217) or at the overthrow of Macrinus (218). This Macrinus, one of the short-time emperors, gave Dio the post of _curator ad corrigendum statum civitatium_, with administrative powers over the cities of Pergamum and Smyrna (Book 79, 7), and his appointee remained in active service during much of the reign of Elagabalus,--possibly, indeed, until the accession of Alexander Severus (see Book 78, 18, end). Mammaea, the mother of the new sovereign, surrounded her son with skilled helpers of proved value, and it was possibly due to her wisdom that Dio was first sent to manage the proconsulate of Africa, and, on his return, to govern the imperial provinces of Dalmatia and Upper Pannonia. Somewhat later, in the year 229, he became consul for the second time, _consul ordinarius_, as colleague of Alexander himself. But Dio's disciplinary measures in Pannonia had rendered him unpopular with the pampered Pretorians, and heeding at once his own safety and the emperor's request he remained most of the time outside of Rome. This state of affairs was not wholly satisfactory, and it is not surprising that after a short time Dio complained of a bad foot and asked leave to betake himself to Nicaea, his native place. Here we must leave him. Whether his death came soon or late after 229 A.D. is a matter of some uncertainty. It would be difficult to make a more complete record out of the available material, save to say that from two casual references it is inferred that Dio had a wife and children, and that in his career he often, sometimes with imperial assistance, tried cases in court. A LIST OF THE MORE RECENT DISSERTATIONS ON CASSIUS DIO. A. Baumgartner.--_Ueber die Quellen des Cassius Dio fuer die aeltere roemische Geschichte._ (1880.) F. Beckurts.--_Zur Quellenkritik des Tacitus, Sueton und Cassius Dio._ (1880.) J. Bergmans.--_Die Quellen der Vita Tiberii (Buch 57 der Historia Romana) des Cassius Dio._ (1903.) Breitung.--_Bemerkungen ueber die Quellen des Dio Cassius LXVI-LXIX._ (1882.) H. Christensen.--_De fontibus a Cassio Dione in Vita Neronis enarranda adhibitis._ (1871.) A. Deppe.--_Des Dio Cassius Bericht ueber die Varusschlacht verglichen mit den uebrigen Geschichtsquellen._ (1880.)