TRAJAN 45 comparatively little departure so long as the army lasted. In disciplinary mat- ters no emperor since Augustus had been able to keep so strong a control over the troops. Pliny rightly praises Trajan as the lawgiver and the founder of dis- cipline, and Vegetius classes Augustus, Trajan, and Hadrian together as re- storers of the morale of the army. The confidence which existed between Tra- jan and his army finds expression in some of the coins of his reign. For nearly two years after his election Trajan did not appear in Rome. He had decided already what the great task of his reign should be the establish- ment of security upon the dangerous northeastern frontier. Before visiting the capital he determined to put affairs in train for the attainment of this great object. He made a thorough inspection of the great lines of defence between the Danube and the Rhine, and framed, and partly carried out, a vast scheme for strengthening and securing them. The policy of opposing uncivilized tribes by the construction of the limes, a raised embankment of earth or other material, intersected here and there by fortifications, was not his invention, but it owed in great measure its development to him. This grand work, which would have excited the envy of Augustus, is traceable in its main extent at the present day. Among a people of roadmakers, Trajan was one of the greatest, and we have definite evidence from inscriptions that some of the military roads in this region were constructed by him. The more secure control which the Romans now maintained over the territory within the limes, tended to its rapid civilization, and the Roman influence, if not the Roman arms, soon began to affect powerfully the regions beyond. After his careful survey of the Rhine end of the great defensive barrier, Trajan proceeded to consider it and plan it from the Danube. From the age of Tiberius onward, the Romans possessed the whole southern bank of the river from its -source to the Euxine. But the precarious tenure of their possession, had been deeply impressed on them by the disasters and humiliations they had undergone in these districts during the reign of Domitian. A prince had arisen among the Dacians, Decebalus by name, worthy to be placed at the head of all the great barbarian antagonists of Rome. Like Maroboduus, he was able to combine the forces of tribes commonly hostile to each other, and his military ability almost went the length of genius. After he had swept the province of Moesia bare, he was defeated by one of Domitian's lieutenants, but the position of affairs on the Danubio-Rhenish border was still so threatening, that the emperor was glad to conclude a treaty which conferred extraordinary advantages on his foe. Not only did the Romans stipulate to pay to Decebalus an annual subsidy, which he must have regarded as a tribute, but they agreed to supply him with engineers and craftsmen skilled in all kinds of construction, but par- ticularly in the erection of fortifications and defensive works. During the nine or ten years which had elapsed since the conclusion of this remarkable treaty, the Dacian prince had immensely strengthened the approaches to his kingdom from the Roman side. He had also equipped and drilled his formidable army after the Roman fashion. It was impossible for a soldier like Trajan to endure
