Furthermore, in Asia Minor and on the east coast of the Mediterranean but a part of the land repays the trouble of cultivation, for it is only the western valleys of the rivers emptying themselves into the Ægean Sea and the northern border of the Black Sea which yield good harvests of wine, oil, and corn; for the Mediterranean coast, with the exception of the rich district of Adana, offers no specially productive ground.
The eastern portion of the Roman Empire, though certainly far behind the west not only in size but also in its products, enjoyed in other ways many advantages denied to the Occident. On account of the vastness of the Western Empire the various cities and places of importance were widely scattered and separated from the chief centre by great distances, which arrangement was undoubtedly advantageous to discontented legions and ambitious officers desirous of revolting against the lawful head of the state. The wide expanse to the northwest, however, occasioned a fatal lengthening of the eastern border line guarded by the easily crossed Rhine and Danube.
The Orient, on the contrary, had its sole coast-line bound by the Mediterranean, a much navigated and frequented sea. No city or town was separated from the others by long stretches of land, for the sea enabled the troops from one garrison to reach another in a few days. The Danube was a weak defence against the barbarians marching from the north, and the natural highway of Baku would not lead invaders into the valley of a river opening into Asia Minor, but straight into Armenia, which being full of chasms and ravines, was easy to defend. Even in the case of an invasion from the north the whole of the East, excepting Egypt, would offer but wild uninhabited country to the enemy.
It was not only the sameness of climate and the consequent similarity of products which bound the various divisions of the East closer together than were those of the West, but it was rather the one spiritual teaching and the equable advancement of education which placed the Orient before the Occident. This latter dominion had two great works of civilisation before it—to instil religious knowledge into the minds of the inhabitants of the northwestern provinces, and to introduce Catholic Christianity, as yet unknown to them. The East on the other hand consisted entirely of pure Greeks or of those who had long learned not only to speak but to think in Greek from their ancestors who, seven centuries before, had accompanied Alexander in his glorious triumphal march to the Hydaspes. The whole populace had long since been turned from the Arian belief, so that any differences in the interpretation of a dogma were now taken up and carefully thought over by all, rich and poor, from north to south alike.
In the Occident, however, there was a strong pagan party at court which had only been outwardly overthrown by the downfall of Eugenius, and needed but a favourable opportunity to reproclaim polytheism, even though it were at the cost of their patriotism.
Ambrose states that Theodosius, when on his death-bed, was far more concerned about the sanctity of the church than the welfare of the state, for he little thought that the two portions of his empire would be separated and become as two worlds with totally different histories. He died in the firm belief that his sons and descendants would never lose sight of the value and importance of unity, and that each would make his own the perils of the other.
By reason of this the two dominions remained united, at least to all outward appearances, for many centuries. All laws and regulations of both were without exception headed by the names of the two rulers, and they were all drawn up in Latin up to the time of Justinian; the year was then as now named after the two consuls, one of whom was appointed by each division.
In Europe north of the Danube the country was being constantly invaded, and consequently the neighbouring provinces, such as Scythia, Mœsia Secunda, Dacia Ripensis, and Mœsia Prima, had numerous troops which were under the command of duces. Thirty-one regiments of cavalry, thirty-nine auxiliaries, a portion of which consisted of well-trained scouts (exploratores), thirty-two legiones riparenses, three of them being exploratores, and three detachments of sailors (nauclerii) were quartered in the numerous fortresses situated either right on the banks of the Danube or as close as possible, especially in Noviodunum, Durostorum, Viminacium, Cebrum, and Margus. The whole of the active military forces consisted, as far as infantry is concerned, of seventy legions, which, all told, would present an army of 420,000 men and thus exceed the Turkish peace army of 151,129 (in war 758,000 men) which occupied that territory in 1885.
As the frontiers of the country were so well protected it may be supposed, though there is but scanty information on the subject, that there was also a strong navy. The fleet served to protect military transports and the grain ships, and helped in the transmission of troops and baggage.
The Eastern as well as the Western Empire had a fleet on the Rhine and on the Danube controlled by those governing the army in that quarter, but the positions of the stations cannot be given with certainty.