For military no less than for commercial purposes—and the Roman occupation of Britain was mainly a military one—good roads were essential, and these the Romans excelled in making. It is remarkable that in the Itinerary of Antoninus Pius, London figures either as the starting point or as the terminus to nearly one-half of the routes described in the portion relating to Britain.(8) The name of one and only one of these Roman highways survives in the city at the present day, and then only in its Teutonic and not Roman form—the Watling or "Wathelinga" Street, the street which led from Kent through the city of London to Chester and York, and thence by two branches to Carlisle and the neighbourhood of Newcastle. The Ermin Street, another Roman road with a Teutonic name, led from London to Lincoln, with branches to Doncaster and York, but its name no longer survives in the city. (M6) The same reasons that led the Romans to establish good roads throughout the country led them also to erect a bridge across the river from London to Southwark, and in later years to enclose the city with a wall. To the building of the bridge, which probably took place in the early years of the Roman occupation, London owed much of its youthful prosperity; whenever any accident happened to the bridge the damage was always promptly repaired. Not so with the walls of the city. They were allowed to fall into decay until the prudence and military genius of the great Alfred caused them to be repaired as a bulwark against the onslaughts of the Danes. (M7) "Britain had been occupied by the Romans, but had not become Roman,"(9) and the scanty and superficial civilization which the Britons had received from the Roman occupation was obliterated by the calamities which followed the northern invasions of the fifth and following centuries. A Christian city, as Augusta had probably been, not a vestige of a Christian church of the Roman period has come down to us.(10) It quickly lapsed into paganism. Its very name disappears, and with it the names of its streets, its traditions and its customs. Its inhabitants forgot the Latin tongue, and the memories of 400 years were clean wiped out. There remains to us of the present day nothing to remind us of London under the Roman empire, save a fragment of a wall, a milestone, a few coins and statuettes, and some articles of personal ornament or domestic use—little more in fact, than what may be seen in the Museum attached to the Guildhall Library. The long subjection to Roman rule had one disastrous effect. It enervated the people and left them powerless to cope with those enemies who, as soon as the iron hand of the Roman legions was removed, came forth from their hiding places to harry the land. (M8)