Among the useful conditions of peace imposed by Probus on the vanquished nations of Germany, was the obligation of supplying the Roman army with sixteen thousand recruits, the bravest and most robust of their youth. The emperor dispersed them through all the provinces, and distributed this dangerous reenforcement, in small bands of fifty or sixty each, among the national troops; judiciously observing, that the aid which the republic derived from the barbarians should be felt but not seen.[1155] Their aid was now become necessary. The feeble elegance of Italy and the internal provinces could no longer support the weight of arms. The hardy frontiers of the Rhine and Danube still produced minds and bodies equal to the labors of the camp; but a perpetual series of wars had gradually diminished their numbers. The infrequency of marriage, and the ruin of agriculture, affected the principles of population, and not only destroyed the strength of the present, but intercepted the hope of future, generations. The wisdom of Probus embraced a great and beneficial plan of replenishing the exhausted frontiers, by new colonies of captive or fugitive barbarians, on whom he bestowed lands, cattle, instruments of husbandry, and every encouragement that might engage them to educate a race of soldiers for the service of the republic. Into Britain, and most probably into Cambridgeshire,[1156] he transported a considerable body of Vandals. The impossibility of an escape reconciled them to their situation, and in the subsequent troubles of that island, they approved themselves the most faithful servants of the state.[1157] Great numbers of Franks and Gepidae were settled on the banks of the Danube and the Rhine. A hundred thousand Bastarnae, expelled from their own country, cheerfully accepted an establishment in Thrace, and soon imbibed the manners and sentiments of Roman subjects.[1158] But the expectations of Probus were too often disappointed. The impatience and idleness of the barbarians could ill brook the slow labors of agriculture. Their unconquerable love of freedom, rising against despotism, provoked them into hasty rebellions, alike fatal to themselves and to the provinces;[1159] nor could these artificial supplies, however repeated by succeeding emperors, restore the important limit of Gaul and Illyricum to its ancient and native vigor.
Of all the barbarians who abandoned their new settlements, and disturbed the public tranquillity, a very small number returned to their own country. For a short season they might wander in arms through the empire; but in the end they were surely destroyed by the power of a warlike emperor. The successful rashness of a party of Franks was attended, however, with such memorable consequences, that it ought not to be passed unnoticed. They had been established by Probus, on the sea-coast of Pontus, with a view of strengthening the frontier against the inroads of the Alani. A fleet stationed in one of the harbors of the Euxine fell into the hands of the Franks; and they resolved, through unknown seas, to explore their way from the mouth of the Phasis to that of the Rhine. They easily escaped through the Bosphorus and the Hellespont, and cruising along the Mediterranean, indulged their appetite for revenge and plunder by frequent descents on the unsuspecting shores of Asia, Greece, and Africa. The opulent city of Syracuse, in whose port the navies of Athens and Carthage had formerly been sunk, was sacked by a handful of barbarians, who massacred the greatest part of the trembling inhabitants. From the Island of Sicily, the Franks proceeded to the columns of Hercules, trusted themselves to the ocean, coasted round Spain and Gaul, and steering their triumphant course through the British Channel, at length finished their surprising voyage, by landing in safety on the Batavian or Frisian shores.[1160] the example of their success, instructing their countrymen to conceive the advantages and to despise the dangers of the sea, pointed out to their enterprising spirit a new road to wealth and glory.
Notwithstanding the vigilance and activity of Probus, it was almost impossible that he could at once contain in obedience every part of his wide-extended dominions. The barbarians, who broke their chains, had seized the favorable opportunity of a domestic war. When the emperor marched to the relief of Gaul, he devolved the command of the East on Saturninus. That general, a man of merit and experience, was driven into rebellion by the absence of his sovereign, the levity of the Alexandrian people, the pressing instances of his friends, and his own fears; but from the moment of his elevation, he never entertained a hope of empire, or even of life. «Alas!» he said, «the republic has lost a useful servant, and the rashness of an hour has destroyed the services of many years. You know not,» continued he, «the misery of sovereign power; a sword is perpetually suspended over our head. We dread our very guards, we distrust our companions. The choice of action or of repose is no longer in our disposition, nor is there any age, or character, or conduct, that can protect us from the censure of envy. In thus exalting me to the throne, you have doomed me to a life of cares, and to an untimely fate. The only consolation which remains is, the assurance that I shall not fall alone.»[1161] But as the former part of his prediction was verified by the victory, so the latter was disappointed by the clemency of Probus. That amiable prince attempted even to save the unhappy Saturninus from the fury of the soldiers. He had more than once solicited the usurper himself to place some confidence in the mercy of a sovereign who so highly esteemed his character, that he had punished, as a malicious informer, the first who related the improbable news of his disaffection[1162] saturninus might, perhaps, have embraced the generous offer, had he not been restrained by the obstinate distrust of his adherents. Their guilt was deeper, and their hopes more sanguine, than those of their experienced leader.
1155
He distributed about fifty or sixty barbarians to a Numerus, as it was then called, a corps with whose established number we are not exactly acquainted.
1156
Camden's Britannia, Introduction, p. 136; but he speaks from a very doubtful conjecture.
1157
Zosimus, l. i. p. 62. According to Vopiscus, another body of Vandals was less faithful.
1158
Footnote 48: Hist. August. p. 240. They were probably expelled by the Goths. Zosim. l. i. p. 66.
1161
Vopiscus in Hist. August. p. 245, 246. The unfortunate orator had studied rhetoric at Carthage; and was therefore more probably a Moor (Zosim. l. i. p. 60) than a Gaul, as Vopiscus calls him.