Gaul meanwhile was becoming as civilised as Italy herself. Numbers of the Gauls who had acquired the Latin speech received the _jus Latinum_, which was almost equivalent to full citizenship. Claudius admitted the chiefs of the Ædui into the Roman senate, and part of the speech in which he did so is preserved on bronze tablets at Lyons. Twice in the course of the century there were interesting attempts to give political expression to the Gallic sense of nationality. The revolt of Vindex at the close of Nero’s reign was little more than a mutiny, but the projected “Empire of the Gauls,” which was set up during the confusion which followed the fall of Vitellius, came very near success. Jealousy between the Gauls and Germans wrecked it. In the case of Germany, it looked for a time as if Tiberius, who, of course, had personal knowledge of the difficulties and advantages of further conquest, meant to break his stepfather’s precept and annex more territory. But probably the annual expeditions of Germanicus were not intended to be more than punitive and demonstrative. Blood enough was shed, and acres enough laid waste, to appease the unburied ghosts of Varus and his legions. But though the great battle of Idistavisus was hailed as a Roman victory, Arminius himself continually eluded the Romans and the legions were more than once in peril of ambush. When Tiberius cried halt, it was open to the critics to find a malevolent explanation in his jealousy of Germanicus, but it is much more likely to have been the deliberate policy of an emperor who had knowledge of Germany. Thus, although Arminius presently fell a victim to his own ambition, and perished by the dagger of a tyrannicide kinsman, he had done his work and saved the liberty of Germany. Henceforth the Romans confined themselves to the Rhine frontier, though they had posts and summer camps beyond it. By degrees the generals of the Upper and Lower Armies in Germany developed into governors of two German provinces, but Germany was unconquered. There was a great military road along the left bank of the Rhine joining the garrison towns where the legions were quartered. Mogontiacum (Mainz) and Vetera Castra (Xanten) remained as the head-quarters, until the latter was superseded by Cologne (Colonia Agrippinensis) founded under Claudius. Trier (Augusta Treverorum), another foundation of about the same date, grew into an important centre of Roman civilisation, as its majestic Roman gate[64] and fine amphitheatre still bear witness. Under Claudius also the great Via Claudia over the Brenner Pass was completed, and the canal joining the Maas to the Rhine. This was better work for Roman soldiers than slaughtering Chatti and Chauci in their native forests. The re-entrant angle of the Rhine and Danube about the Black Forest, where the rivers run small, was recognised as a danger-point. The barbarian Germans were accordingly cleared away to make room for a body of Gallic emigrants,