The whole of Roman London is lost, except for the foundations, some of which still lie underground. All the churches, temples, theatres, official buildings, palaces, and villas are all gone. They were lost when the Saxons took possession of the town. The names of the streets are gone—their very tradition has perished. The course of the streets is lost and forgotten. This fact alone proves beyond a doubt that the occupation of London was not continuous.[21] The Roman gate of Bishopsgate lay some distance to the east of the Saxon gate; the Roman gate in Watling Street lay some distance to the north of the later Newgate; the line of the Ermin Street did not anywhere coincide exactly with the Roman road; the new Watling Street of the Saxons actually crossed the old one. We may note, also, that an ancient causeway lies under the tower of St. Mary le Bow. How can these facts be reconciled with the theory of continuous occupation? The Saxons, again, did not come in as conquerors and settle down among the conquered. They cannot have done so; otherwise they would have acquired and preserved something of Roman London. And though we should not, at this day, after so many years and so many fires, expect to find Roman villas standing, we should have some of the old streets with Roman or at least British names. All that is left to us, by tradition, of Roman London is its British name.
The destruction of a deserted city advances slowly at first, but always with acceleration. The woodwork of Roman London was carried off to build rude huts for the fisher-folk and the few slaves who stayed behind. They had at least their liberty, and lived on beside the deserted shore. The gentle action of rain and frost and sunshine contributed a never-ceasing process of disintegration; clogged watercourses undermined the foundations; trees sprang up amid the chambers and dropped their leaves and decayed and died; ivy pulled down the tiles and pushed between the bricks; new vegetation raised the level of the ground; the walls of the houses either fell or slowly disappeared. When, after a hundred years of desolation, the Saxon ventured to make his home within the ruined walls of the City, even if it were only to use the site after his manner at Silchester and Uriconium, as a place for the plough to be driven over and for the corn to grow, there was little indeed left of the splendour of the former Augusta.