The conduct which the emperor Probus had adopted in the disposal of the vanquished, was imitated by Diocletian and his associates. The captive barbarians, exchanging death for slavery, were distributed among the provincials, and assigned to those districts (in Gaul, the territories of Amiens, Beauvais, Cambray, Treves, Langres, and Troyes, are particularly specified ) which had been depopulated by the calamities of war. They were usefully employed as shepherds and husbandmen, but were denied the exercise of arms, except when it was found expedient to enroll them in the military service. Nor did the emperors refuse the property of lands, with a less servile tenure, to such of the barbarians as solicited the protection of Rome. They granted a settlement to several colonies of the Carpi, the Bastarnæ, and the Sarmatians; and, by a dangerous indulgence, permitted them in some measure to retain their national manners and independence. Among the provincials, it was a subject of flattering exultation, that the barbarian, so lately an object of terror, now cultivated their lands, drove their cattle to the neighboring fair, and contributed by his labor to the public plenty. They congratulated their masters on the powerful accession of subjects and soldiers; but they forgot to observe, that multitudes of secret enemies, insolent from favor, or desperate from oppression, were introduced into the heart of the empire.

While the Cæsars exercised their valor on the banks of the Rhine and Danube, the presence of the emperors was required on the southern confines of the Roman world. From the Nile to Mount Atlas Africa was in arms. A confederacy of five Moorish nations issued from their deserts to invade the peaceful provinces. Julian had assumed the purple at Carthage. Achilleus at Alexandria, and even the Blemmyes, renewed, or rather continued, their incursions into the Upper Egypt. Scarcely any circumstances have been preserved of the exploits of Maximian in the western parts of Africa; but it appears, by the event, that the progress of his arms was rapid and decisive, that he vanquished the fiercest barbarians of Mauritania, and that he removed them from the mountains, whose inaccessible strength had inspired their inhabitants with a lawless confidence, and habituated them to a life of rapine and violence. Diocletian, on his side, opened the campaign in Egypt by the siege of Alexandria, cut off the aqueducts which conveyed the waters of the Nile into every quarter of that immense city, and rendering his camp impregnable to the sallies of the besieged multitude, he pushed his reiterated attacks with caution and vigor. After a siege of eight months, Alexandria, wasted by the sword and by fire, implored the clemency of the conqueror, but it experienced the full extent of his severity. Many thousands of the citizens perished in a promiscuous slaughter, and there were few obnoxious persons in Egypt who escaped a sentence either of death or at least of exile. The fate of Busiris and of Coptos was still more melancholy than that of Alexandria: those proud cities, the former distinguished by its antiquity, the latter enriched by the passage of the Indian trade, were utterly destroyed by the arms and by the severe order of Diocletian. The character of the Egyptian nation, insensible to kindness, but extremely susceptible of fear, could alone justify this excessive rigor. The seditions of Alexandria had often affected the tranquillity and subsistence of Rome itself. Since the usurpation of Firmus, the province of Upper Egypt, incessantly relapsing into rebellion, had embraced the alliance of the savages of Æthiopia. The number of the Blemmyes, scattered between the Island of Meroe and the Red Sea, was very inconsiderable, their disposition was unwarlike, their weapons rude and inoffensive. Yet in the public disorders, these barbarians, whom antiquity, shocked with the deformity of their figure, had almost excluded from the human species, presumed to rank themselves among the enemies of Rome. Such had been the unworthy allies of the Egyptians; and while the attention of the state was engaged in more serious wars, their vexations inroads might again harass the repose of the province. With a view of opposing to the Blemmyes a suitable adversary, Diocletian persuaded the Nobatæ, or people of Nubia, to remove from their ancient habitations in the deserts of Libya, and resigned to them an extensive but unprofitable territory above Syene and the cataracts of the Nile, with the stipulation, that they should ever respect and guard the frontier of the empire. The treaty long subsisted; and till the establishment of Christianity introduced stricter notions of religious worship, it was annually ratified by a solemn sacrifice in the Isle of Elephantine, in which the Romans, as well as the barbarians, adored the same visible or invisible powers of the universe.

At the same time that Diocletian chastised the past crimes of the Egyptians, he provided for their future safety and happiness by many wise regulations, which were confirmed and enforced under the succeeding reigns. One very remarkable edict which he published, instead of being condemned as the effect of jealous tyranny, deserves to be applauded as an act of prudence and humanity. He caused a diligent