The country on the left bank of the lower Danube, the modern Transylvania, Wallachia, Moldavia was at this time inhabited by a portion of the Sarmatian or Slavonian race named the Dacians, and remarkable for their valour. The extension of the Roman frontier to the Danube in the time of Augustus, had caused occasional collisions with this martial race; but no war of any magnitude occurred till the present reign. The prince of the Dacians at this time, named Decebalus, was one of those energetic characters often to be found among barbarous tribes, to whom nature has given all the elements of greatness, but fortune has assigned a narrow and inglorious stage for their exhibition. It was probably the desire of military glory and of plunder, rather than fear of the avarice of Domitian, the only cause assigned, that made Decebalus at this time (86) set at nought the treaties subsisting with the Romans, and lead his martial hordes over the Danube. The troops that opposed them were routed and cut to pieces; the garrisons and castles were taken, and apprehensions were entertained for the winter quarters of the legions. The danger seemed so imminent, that the general wish was manifested for the conduct of the war being committed to Agricola; and the imperial freedmen, some from good, others from evil motives, urged their master to compliance. But his jealousy of that illustrious man was invincible, and he resolved to superintend the war in person.
Domitian proceeded to Illyricum, where he was met by Dacian deputies with proposals of peace, on condition of a capitation tax of two oboles a head being paid to Decebalus. The emperor forthwith ordered Cornelius Fuscus, the governor of Illyricum, to lead his army over the Danube, and chastise the insolent barbarians. Fuscus passed the river by a bridge of boats; he gained some advantages over the enemy, but his army was finally defeated and himself slain. Domitian, who had returned to Rome, hastened back to the seat of war; but instead of heading his troops, he stopped in a town of Mœsia, where he gave himself up to his usual pleasures, leaving the conduct of the war to his generals, who, though they met with some reverses, were in general successful; and Decebalus was reduced to the necessity of suing for peace. Domitian refused to grant it; but shortly after, having sustained a defeat from the Marcomans whom he wished to punish for not having assisted him against the Dacians, he sent to offer peace to Decebalus. The Dacian was not in a condition to refuse it, but he would seem to have dictated the terms; and in effect an annual tribute was henceforth paid to him by the Roman emperor. Domitian, however, triumphed for the Dacians and Marcomans, though he paid tribute to the former, and had been defeated by the latter.
During the Dacian War (88), L. Antonius, who commanded in Upper Germany, having been grossly insulted by the emperor, formed an alliance with the Alamanni, and caused himself to be proclaimed emperor. But L. Maximus marched against him, and the Alamanni, having been prevented from coming to his aid by the rising of the Rhine, he was defeated and slain.
Maximus wisely and humanely burned all his papers, but that did not prevent the tyrant from putting many persons to death as concerned in the revolt.
A war against the Sarmatians, who had cut to pieces a Roman legion, is placed by the chronologists in the year 93. Domitian conducted it in person, after his usual manner; but instead of triumphing, he contented himself with suspending a laurel crown in the Capitol. This is the last foreign transaction of his reign.
Domitian’s principal faults were an immoderate pride, boundless prodigality, and a childish desire to distinguish himself. His appearance, his voice, and, in short, his whole bearing betrayed a proud and despotic nature. By his unrestrained prodigalities he was drawn into avarice and rapacity, and his fear of intrigues made him cruel. Spoilt by indulgences in early youth, as emperor he gave way to an unbridled taste for public amusements, cruel sports, gladiatorial games, chariot races, and a foolish passion for building. These extravagances entailed a continual lack of money, which drove him to oppression and cruelty. At the last, he hated and avoided mankind as Tiberius had done and became insane like Caligula. He was not wanting in intellectual abilities; as a young man he had made very good verses, had composed a poem on the conquest of Jerusalem, and had written a better translation of the poem of Aratus on the stars, than Cicero and Germanicus. As soon as he succeeded to the throne, he considered it beneath his dignity to occupy himself with intellectual things; from thenceforth he only studied the records and journals of Tiberius, and left the composition of his letters, ordinances, and speeches almost entirely to others.