17. =The Colony of Camulodunum.=--In =47= Aulus Plautius was succeeded by Ostorius Scapula. He disarmed the tribes dwelling to the west of the Trent, whilst he attempted to establish the Roman authority more firmly over those whose territory lay to the east of that river. Amongst these later were the Iceni, who had been hitherto allowed to preserve their native government in dependence on the Roman power. The consequence was that they rose in arms. Ostorius overpowered them, and then sought to strengthen his hold upon the south-east of Britain by founding (=51=) a Roman colony at Camulodunum, which had formerly been the headquarters of Cunobelin. Roman settlers--for the most part discharged soldiers--established themselves in the new city, bringing with them all that belonged to Roman life with all its conveniences and luxuries. Roman temples, theatres, and baths quickly rose, and Ostorius might fairly expect that in Britain, as in Gaul, the native chiefs would learn to copy the easy life of the new citizens, and would settle their quarrels in Roman courts of law instead of taking arms on their own behalf. 18. =The Conquests of Ostorius Scapula.=--Ostorius, however, was soon involved in fresh troubles. Nothing is more difficult for a civilised power than to guard a frontier against barbarous tribes. Such tribes are accustomed to plunder one another, and they are quick to perceive that the order and peace which a civilised power establishes offers them a richer booty than is to be found elsewhere. The tribes beyond the line which Ostorius held were constantly breaking through to plunder the Roman territory, and he soon found that he must either allow the lands of Roman subjects to be plundered, or must carry war amongst the hostile tribes. He naturally chose the latter alternative, and the last years of his government were spent in wars with the Ordovices of Central Wales, and with the Silures of Southern Wales. The Silures were not only a most warlike people, but they were led by Caratacus, who had taken refuge with them after his defeat by Aulus Plautius in the east. The mountainous region which these two tribes defended made it difficult to subdue them, and though Caratacus was defeated (=50=), and ultimately captured and sent as a prisoner to Rome, Ostorius did not succeed in effectually mastering his hardy followers. The proof of his comparative failure lies in the fact that he established strong garrison towns along the frontier of the hilly region, which he would not have done unless he had considered it necessary to have a large number of soldiers ready to check any possible rising. At the northern end of the line was Deva (_Chester_), at the southern was Isca Silurum (_Caerleon upon Usk_) and in each of which was placed a whole legion, about 5,000 men. Between them was the smaller post of Uriconium, or more properly Viriconium (_Wroxeter_), the city of the Wrekin.