Ostentation was the first principle of the new system instituted by Diocletian. The second was division. He divided the empire, the provinces, and every branch of the civil as well as military administration. He multiplied the wheels of the machine of government, and rendered its operations less rapid, but more secure. Whatever advantages and whatever defects might attend these innovations, they must be ascribed in a very great degree to the first inventor; but as the new frame of policy was gradually improved and completed by succeeding princes, it will be more satisfactory to delay the consideration of it till the season of its full maturity and perfection. 103 Reserving, therefore, for the reign of Constantine a more exact picture of the new empire, we shall content ourselves with describing the principal and decisive outline, as it was traced by the hand of Diocletian. He had associated three colleagues in the exercise of the supreme power; and as he was convinced that the abilities of a single man were inadequate to the public defence, he considered the joint administration of four princes not as a temporary expedient, but as a fundamental law of the constitution. It was his intention, that the two elder princes should be distinguished by the use of the diadem, and the title of Augusti; that, as affection or esteem might direct their choice, they should regularly call to their assistance two subordinate colleagues; and that the Coesars, rising in their turn to the first rank, should supply an uninterrupted succession of emperors. The empire was divided into four parts. The East and Italy were the most honorable, the Danube and the Rhine the most laborious stations. The former claimed the presence of the Augusti, the latter were intrusted to the administration of the Coesars. The strength of the legions was in the hands of the four partners of sovereignty, and the despair of successively vanquishing four formidable rivals might intimidate the ambition of an aspiring general. In their civil government, the emperors were supposed to exercise the undivided power of the monarch, and their edicts, inscribed with their joint names, were received in all the provinces, as promulgated by their mutual councils and authority. Notwithstanding these precautions, the political union of the Roman world was gradually dissolved, and a principle of division was introduced, which, in the course of a few years, occasioned the perpetual separation of the Eastern and Western Empires.
The system of Diocletian was accompanied with another very material disadvantage, which cannot even at present be totally overlooked; a more expensive establishment, and consequently an increase of taxes, and the oppression of the people. Instead of a modest family of slaves and freedmen, such as had contented the simple greatness of Augustus and Trajan, three or four magnificent courts were established in the various parts of the empire, and as many Roman kings contended with each other and with the Persian monarch for the vain superiority of pomp and luxury. The number of ministers, of magistrates, of officers, and of servants, who filled the different departments of the state, was multiplied beyond the example of former times; and (if we may borrow the warm expression of a contemporary) “when the proportion of those who received, exceeded the proportion of those who contributed, the provinces were oppressed by the weight of tributes.” 104 From this period to the extinction of the empire, it would be easy to deduce an uninterrupted series of clamors and complaints. According to his religion and situation, each writer chooses either Diocletian, or Constantine, or Valens, or Theodosius, for the object of his invectives; but they unanimously agree in representing the burden of the public impositions, and particularly the land tax and capitation, as the intolerable and increasing grievance of their own times. From such a concurrence, an impartial historian, who is obliged to extract truth from satire, as well as from panegyric, will be inclined to divide the blame among the princes whom they accuse, and to ascribe their exactions much less to their personal vices, than to the uniform system of their administration. * The emperor Diocletian was indeed the author of that system; but during his reign, the growing evil was confined within the bounds of modesty and discretion, and he deserves the reproach of establishing pernicious precedents, rather than of exercising actual oppression. 105 It may be added, that his revenues were managed with prudent economy; and that after all the current expenses were discharged, there still remained in the Imperial treasury an ample provision either for judicious liberality or for any emergency of the state.
It was in the twenty first year of his reign that Diocletian executed his memorable resolution of abdicating the empire; an action more naturally to have been expected from the elder or the younger Antoninus, than from a prince who had never practised the lessons of philosophy either in the attainment or in the use of supreme power. Diocletian acquired the glory of giving to the world the first example of a resignation, 106 which has not been very frequently imitated by succeeding monarchs. The parallel of Charles the Fifth, however, will naturally offer itself to our mind, not only since the eloquence of a modern historian has rendered that name so familiar to an English reader, but from the very striking resemblance between the characters of the two emperors, whose political abilities were superior to their military genius, and whose specious virtues were much less the effect of nature than of art. The abdication of Charles appears to have been hastened by the vicissitude of fortune; and the disappointment of his favorite schemes urged him to relinquish a power which he found inadequate to his ambition. But the reign of Diocletian had flowed with a tide of uninterrupted success; nor was it till after he had vanquished all his enemies, and accomplished all his designs, that he seems to have entertained any serious thoughts of resigning the empire. Neither Charles nor Diocletian were arrived at a very advanced period of life; since the one was only fifty — five, and the other was no more than fifty-nine years of age; but the active life of those princes, their wars and journeys, the cares of royalty, and their application to business, had already impaired their constitution, and brought on the infirmities of a premature old age. 107
Notwithstanding the severity of a very cold and rainy winter, Diocletian left Italy soon after the ceremony of his triumph, and began his progress towards the East round the circuit of the Illyrian provinces. From the inclemency of the weather, and the fatigue of the journey, he soon contracted a slow illness; and though he made easy marches, and was generally carried in a close litter, his disorder, before he arrived at Nicomedia, about the end of the summer, was become very serious and alarming. During the whole winter he was confined to his palace: his danger inspired a general and unaffected concern; but the people could only judge of the various alterations of his health, from the joy or consternation which they discovered in the countenances and behavior of his attendants. The rumor of his death was for some time universally believed, and it was supposed to be concealed with a view to prevent the troubles that might have happened during the absence of the Caesar Galerius. At length, however, on the first of March, Diocletian once more appeared in public, but so pale and emaciated, that he could scarcely have been recognized by those to whom his person was the most familiar. It was time to put an end to the painful struggle, which he had sustained during more than a year, between the care of his health and that of his dignity. The former required indulgence and relaxation, the latter compelled him to direct, from the bed of sickness, the administration of a great empire. He resolved to pass the remainder of his days in honorable repose, to place his glory beyond the reach of fortune, and to relinquish the theatre of the world to his younger and more active associates. 108
The ceremony of his abdication was performed in a spacious plain, about three miles from Nicomedia. The emperor ascended a lofty throne, and in a speech, full of reason and dignity, declared his intention, both to the people and to the soldiers who were assembled on this extraordinary occasion. As soon as he had divested himself of his purple, he withdrew from the gazing multitude; and traversing the city in a covered chariot, proceeded, without delay, to the favorite retirement