One more point may be made out from history. Since London was a town which then, as now, lived entirely by its trade and was the centre of the export and import trade of the whole country, the merchants, as we have seen, must have suffered most severely long before the Romans went away. We are, therefore, in the year 410, facing a situation full of menace. The Picts and Scots are overrunning the whole of the north, the Saxons are harrying the east and the south-east, trade is dying, there is little demand for imports, there are few exports, it is useless for ships to wait cargoes which never arrive, it is useless for ships to bring cargoes for which there is no demand.
[Illustration: REMAINS OF A VIKING SHIP, FROM A CAIRN AT GOKSTAD.
(_Now in the University at Christiania._)]
A declining city, a dying trade, enemies in all directions, an unwarlike population. When the curtain falls upon the scene in the year 410 that is what we see.
Consider, again, the position of London. It stood, as you have seen, originally on two low hills overlooking the river. A strong wall built all along the bank from Blackfriars (now so called) to the present site of the Tower kept the river from swamping the houses and wharves which sprang up behind this wall. The walls of the City later on, but only about fifty years before the Romans went away, enclosed a large area covered over with streets, narrow near the river and broad farther north, and with residences, warehouses, villas, and workshops. There was probably a population of 70,000 or even more. On the west, in the direction of Westminster, the City wall overlooked an immense marsh: on the south across the river there was a still broader and longer marsh: on the east there was another great marsh with the sea overflowing the sedgy meadows at every high tide: on the north there was a wild moor and beyond the moor there was an immense forest. Four roads not counting the river-way kept the City in communication with the rest of the island. The most important of these roads was that afterwards called Watling Street, which passed out at Newgate and led across the heart of the country to Chester and Wales, to York and the north. The second, afterwards called Ermyn Street, left the City at Bishopsgate and ran through Lincoln to York, a third road called the Vicinal Way ran into the eastern counties, and by way of London Bridge Watling Street was connected with Dover.