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.
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 the 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
Before we dismiss the consideration of the life and character of Diocletian, we may, for a moment, direct our view to the place of his retirement. Salona, a principal city of his native province of Dalmatia, was near two hundred Roman miles (according to the measurement of the public highways) from Aquileia and the confines of Italy, and about two hundred and seventy from Sirmium, the usual residence of the emperors whenever they visited the Illyrian frontier. 115 A miserable village still preserves the name of Salona; but so late as the sixteenth century, the remains of a theatre, and a confused prospect of broken arches and marble columns, continued to attest its ancient splendor. 116 About six or seven miles from the city, Diocletian constructed a magnificent palace, and we may infer, from the greatness of the work, how long he had meditated his design of abdicating the empire. The choice of a spot which united all that could contribute either to health or to luxury, did not require the partiality of a native. “The soil was dry and fertile, the air is pure and wholesome, and though extremely hot during the summer months, this country seldom feels those sultry and noxious winds, to which the coasts of Istria and some parts of Italy are exposed. The views from the palace are no less beautiful than the soil and climate were inviting. Towards the west lies the fertile shore that stretches along the Adriatic, in which a number of small islands are scattered in such a manner, as to give this part of the sea the appearance of a great lake. On the north side lies the bay, which led to the ancient city of Salona; and the country beyond it, appearing in sight, forms a proper contrast to that more extensive prospect of water, which the Adriatic presents both to the south and to the east. Towards the north, the view is terminated by high and irregular mountains, situated at a proper distance, and in many places covered with villages, woods, and vineyards.” 117
Though Constantine, from a very obvious prejudice, affects to mention the palace of Diocletian with contempt, 118 yet one of their successors, who could only see it in a neglected and mutilated state, celebrates its magnificence in terms of the highest admiration. 119 It covered an extent of ground consisting of between nine and ten English acres. The form was quadrangular, flanked with sixteen towers. Two of the sides were near six hundred, and the other two near seven hundred feet in length. The whole was constructed of a beautiful freestone, extracted from the neighboring quarries of Trau, or Tragutium, and very little inferior to marble itself. Four streets, intersecting each other at right angles, divided the several parts of this great edifice, and the approach to the principal apartment was from a very stately entrance, which is still denominated the Golden Gate. The approach was terminated by a peristylium of granite columns, on one side of which we discover the square temple of Aesculapius, on the other the octagon temple of Jupiter. The latter of those deities Diocletian revered as the patron of his fortunes, the former as the protector of his health. By comparing the present remains with the precepts of Vitruvius, the several parts of the building, the baths, bed-chamber, the atrium, the basilica, and the Cyzicene, Corinthian, and Egyptian halls have been described with some degree of precision, or at least of probability. Their forms were various, their proportions just; but they all were attended with two imperfections, very repugnant to our modern notions of taste and conveniency. These stately rooms had neither windows nor chimneys. They were lighted from the top, (for the building seems to have consisted of no more than one story,) and they received their heat by the help of pipes that were conveyed along the walls. The range of principal apartments was protected towards the south-west by a portico five hundred and seventeen feet long, which must have formed a very noble and delightful walk, when the beauties of painting and sculpture were added to those of the prospect.
Had this magnificent edifice remained in a solitary country, it would have been exposed to the ravages of time; but it might, perhaps, have escaped the rapacious industry of man. The village of Aspalathus, 120 and, long afterwards, the provincial town of Spalatro, have grown out of its ruins. The