Disgusted with the licentious familiarity of the people, he quitted Rome with precipitation thirteen days before it was expected that he should have appeared in the senate, invested with the ensigns of the consular dignity. 92
The dislike expressed by Diocletian towards Rome and Roman freedom, was not the effect of momentary caprice, but the result of the most artful policy. That crafty prince had framed a new system of Imperial government, which was afterwards completed by the family of Constantine; and as the image of the old constitution was religiously preserved in the senate, he resolved to deprive that order of its small remains of power and consideration. We may recollect, about eight years before the elevation, of Diocletian the transient greatness, and the ambitious hopes, of the Roman senate. As long as that enthusiasm prevailed, many of the nobles imprudently displayed their zeal in the cause of freedom; and after the successes of Probus had withdrawn their countenance from the republican party, the senators were unable to disguise their impotent resentment. As the sovereign of Italy, Maximian was intrusted with the care of extinguishing this troublesome, rather than dangerous spirit, and the task was perfectly suited to his cruel temper. The most illustrious members of the senate, whom Diocletian always affected to esteem, were involved, by his colleague, in the accusation of imaginary plots; and the possession of an elegant villa, or a well-cultivated estate, was interpreted as a convincing evidence of guilt. 93 The camp of the Praetorians, which had so long oppressed, began to protect, the majesty of Rome; and as those haughty troops were conscious of the decline of their power, they were naturally disposed to unite their strength with the authority of the senate. By the prudent measures of Diocletian, the numbers of the Praetorians were insensibly reduced, their privileges abolished, 94 and their place supplied by two faithful legions of Illyricum, who, under the new titles of Jovians and Herculians, were appointed to perform the service of the Imperial guards. 95 But the most fatal though secret wound, which the senate received from the hands of Diocletian and Maximian, was inflicted by the inevitable operation of their absence. As long as the emperors resided at Rome, that assembly might be oppressed, but it could scarcely be neglected. The successors of Augustus exercised the power of dictating whatever laws their wisdom or caprice might suggest; but those laws were ratified by the sanction of the senate. The model of ancient freedom was preserved in its deliberations and decrees; and wise princes, who respected the prejudices of the Roman people, were in some measure obliged to assume the language and behavior suitable to the general and first magistrate of the republic. In the armies and in the provinces, they displayed the dignity of monarchs; and when they fixed their residence at a distance from the capital, they forever laid aside the dissimulation which Augustus had recommended to his successors. In the exercise of the legislative as well as the executive power, the sovereign advised with his ministers, instead of consulting the great council of the nation. The name of the senate was mentioned with honor till the last period of the empire; the vanity of its members was still flattered with honorary distinctions; 96 but the assembly which had so long been the source, and so long the instrument of power, was respectfully suffered to sink into oblivion. The senate of Rome, losing all connection with the Imperial court and the actual constitution, was left a venerable but useless monument of antiquity on the Capitoline hill.
When the Roman princes had lost sight of the senate and of their ancient capital, they easily forgot the origin and nature of their legal power. The civil offices of consul, of proconsul, of censor, and of tribune, by the union of which it had been formed, betrayed to the people its republican extraction. Those modest titles were laid aside; 97 and if they still distinguished their high station by the appellation of Emperor, or Imperator, that word was understood in a new and more dignified sense, and no longer denoted the general of the Roman armies, but the sovereign of the Roman world. The name of Emperor, which was at first of a military nature, was associated with another of a more servile kind. The epithet of Dominus, or Lord, in its primitive signification, was expressive, not of the authority of a prince over his subjects, or of a commander over his soldiers, but of the despotic power of a master over his domestic slaves. 98 Viewing it in that odious light, it had been rejected with abhorrence by the first Caesars. Their resistance insensibly became more feeble, and the name less odious; till at length the style of our Lord and Emperor was not only bestowed by flattery, but was regularly admitted into the laws and public monuments. Such lofty epithets were sufficient to elate and satisfy the most excessive vanity; and if the successors of Diocletian still declined the title of King, it seems to have been the effect not so much of their moderation as of their delicacy. Wherever the Latin tongue was in use, (and it was the language of government throughout the empire,) the Imperial title, as it was peculiar to themselves, conveyed a more respectable idea than the name of king, which they must have shared with a hundred barbarian chieftains; or which, at the best, they could derive only from Romulus, or from Tarquin. But the sentiments of the East were very different from those of the West. From the earliest period of history, the sovereigns of Asia had been celebrated in the Greek language by the title of Basileus, or King; and since it was considered as the first distinction among men, it was soon employed by the servile provincials of the East, in their humble addresses to the Roman throne. 99 Even the attributes, or at least the titles, of the Divinity, were usurped by Diocletian and Maximian, who transmitted them to a succession of Christian emperors. 100 Such extravagant compliments, however, soon lose their impiety by losing their meaning; and when the ear is once accustomed to the sound, they are heard with indifference, as vague though excessive professions of respect.
From the time of Augustus to that of Diocletian, the Roman princes, conversing in a familiar manner among their fellow-citizens, were saluted only with the same respect that was usually paid to senators and magistrates. Their principal distinction was the Imperial or military robe of purple; whilst the senatorial garment was marked by a broad, and the equestrian by a narrow, band or stripe of the same honorable color. The pride, or rather the policy, of Diocletian, engaged that artful prince to introduce the stately magnificence of the court of Persia. 101 He ventured to assume the diadem, an ornament detested by the Romans as the odious ensign of royalty, and the use of which had been considered as the most desperate act of the madness of Caligula. It was no more than a broad white fillet set with pearls, which encircled the emperor’s head. The sumptuous robes of Diocletian and his successors were of silk and gold; and it is remarked with indignation, that even their shoes were studded with the most precious gems. The access to their sacred person was every day rendered more difficult by the institution of new forms and ceremonies. The avenues of the palace were strictly guarded by the various schools, as they began to be called, of domestic officers. The interior apartments were intrusted to the jealous vigilance of the eunuchs, the increase of whose numbers and influence was the most infallible symptom of the progress of despotism. When a subject was at length admitted to the Imperial presence, he was obliged, whatever might be his rank, to fall prostrate on the ground, and to adore, according to the eastern fashion, the divinity of his lord and master. 102 Diocletian was a man of sense, who, in the course of private as well as public life, had formed a just estimate both of himself and of mankind: nor is it easy to conceive, that in substituting the manners of Persia to those of Rome, he was seriously actuated by so mean a principle as that of vanity. He flattered himself, that an ostentation of splendor and luxury would subdue the imagination of the multitude; that the monarch would be less exposed to the rude license of the people and the soldiers, as his person was secluded from the public view; and that habits of submission would insensibly be productive of sentiments of veneration. Like the modesty affected by Augustus, the state maintained by Diocletian was a theatrical representation; but it must be confessed, that of the two comedies,