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[ Aurelius Victor ascribes the abdication, which had been so variously accounted for, to two causes: 1st, Diocletian’s contempt of ambition; and 2dly, His apprehension of impending troubles. One of the panegyrists (vi. 9) mentions the age and infirmities of Diocletian as a very natural reason for his retirement. * Note: Constantine (Orat. ad Sanct. c. 401) more than insinuated that derangement of mind, connected with the conflagration of the palace at Nicomedia by lightning, was the cause of his abdication. But Heinichen. in a very sensible note on this passage in Eusebius, while he admits that his long illness might produce a temporary depression of spirits, triumphantly appeals to the philosophical conduct of Diocletian in his retreat, and the influence which he still retained on public affairs.—M.]
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 which he had chosen in his native country of Dalmatia. On the same day, which was the first of May, [109] Maximian, as it had been previously concerted, made his resignation of the Imperial dignity at Milan.
Even in the splendor of the Roman triumph, Diocletian had meditated his design of abdicating the government. As he wished to secure the obedience of Maximian, he exacted from him either a general assurance that he would submit his actions to the authority of his benefactor, or a particular promise that he would descend from the throne, whenever he should receive the advice and the example. This engagement, though it was confirmed by the solemnity of an oath before the altar of the Capitoline Jupiter, [110] would have proved a feeble restraint on the fierce temper of Maximian, whose passion was the love of power, and who neither desired present tranquility nor future reputation. But he yielded, however reluctantly, to the ascendant which his wiser colleague had acquired over him, and retired, immediately after his abdication, to a villa in Lucania, where it was almost impossible that such an impatient spirit could find any lasting tranquility.
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[ The difficulties as well as mistakes attending the dates both of the year and of the day of Diocletian’s abdication are perfectly cleared up by Tillemont, Hist. des Empereurs, tom. iv. p 525, note 19, and by Pagi ad annum.]
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[ See Panegyr. Veter. vi. 9. The oration was pronounced after Maximian had resumed the purple.]
Diocletian, who, from a servile origin, had raised himself to the throne, passed the nine last years of his life in a private condition. Reason had dictated, and content seems to have accompanied, his retreat, in which he enjoyed, for a long time, the respect of those princes to whom he had resigned the possession of the world. [111] It is seldom that minds long exercised in business have formed any habits of conversing with themselves, and in the loss of power they principally regret the want of occupation. The amusements of letters and of devotion, which afford so many resources in solitude, were incapable of fixing the attention of Diocletian; but he had preserved, or at least he soon recovered, a taste for the most innocent as well as natural pleasures, and his leisure hours were sufficiently employed in building, planting, and gardening. His answer to Maximian is deservedly celebrated. He was solicited by that restless old man to reassume the reins of government, and the Imperial purple. He rejected the temptation with a smile of pity, calmly observing, that if he could show Maximian the cabbages which he had planted with his own hands at Salona, he should no longer be urged to relinquish the enjoyment of happiness for the pursuit of power. [112] In his conversations with his friends, he frequently acknowledged, that of all arts, the most difficult was the art of reigning; and he expressed himself on that favorite topic with a degree of warmth which could be the result only of experience. “How often,” was he accustomed to say, “is it the interest of four or five ministers to combine together to deceive their sovereign! Secluded from mankind by his exalted dignity, the truth is concealed from his knowledge; he can see only with their eyes, he hears nothing but their misrepresentations. He confers the most important offices upon vice and weakness, and disgraces the most virtuous and deserving among his subjects. By such infamous arts,” added Diocletian, “the best and wisest princes are sold to the venal corruption of their courtiers.” [113] A just estimate of greatness, and the assurance of immortal fame, improve our relish for the pleasures of retirement; but the Roman emperor had filled too important a character in the world, to enjoy without alloy the comforts and security of a private condition. It was impossible that he could remain ignorant of the troubles which afflicted the empire after his abdication. It was impossible that he could be indifferent to their consequences. Fear, sorrow, and discontent, sometimes pursued him into the solitude of Salona. His tenderness, or at least his pride, was deeply wounded by the misfortunes of his wife and daughter; and the last moments of Diocletian were imbittered by some affronts, which Licinius and Constantine might have spared the father of so many emperors, and the first author of their own fortune. A report, though of a very doubtful nature, has reached our times, that he prudently withdrew himself from their power by a voluntary death. [114]
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[ Eumenius pays him a very fine compliment: “At enim divinum illum virum, qui primus imperium et participavit et posuit, consilii et fact isui non poenitet; nec amisisse se putat quod sponte transcripsit. Felix beatusque vere quem vestra, tantorum principum, colunt privatum.” Panegyr. Vet. vii. 15.]