The Romans, when they resolved to settle in England, established themselves on the opposite hillock, the eastern bank of the Walbrook. The situation was not so strong as that of the British town, because it was protected by cliff and river on two sides only instead of three. But the Romans depended on their walls and their arms rather than the position of their town. As was their habit they erected here a strong fortress or a stationary camp, such as others which remain in the country. Perhaps the Roman building which most resembles this fort is the walled enclosure called Porchester, which stands at the head of Portsmouth Harbour. This is rectangular in shape and is contained by a high wall built of rubble stone and narrow bricks, with round, hollow bastions at intervals. One may also see such a stationary camp at Richborough, near Sandwich; and at Pevensey, in Sussex; and at Silchester, near Reading, but the two latter are not rectangular. One end of this fort was on the top of the Walbrook bank and the other, if you look in your map, on the site of Mincing Lane. This gives a length of about 700 yards by a breadth of 350, which means an enclosure of about 50 acres. This is a large area: it was at once the barrack, the arsenal, and the treasury of the station; it contained the residences of the officers, the offices of the station, the law court and tribunals, and the prisons; it was the official residence. Outside the fort on the north was the burial place. If we desire to know the character of the buildings we may assure ourselves that they were not mean or ignoble by visiting the Roman town of Silchester. Here we find that the great Hall of Justice was a hall more spacious than Westminster Hall, though doubtless not so lofty or so fine. Attached to this hall were other smaller rooms for the administration of justice; on one side was an open court with a cloister or corridor running all round it and shops at the back for the sale of everything. This was the centre of the city: here the courts were held; this was the Exchange; here were the baths; this was the place where the people resorted in the morning and lounged about to hear the news; here the jugglers and the minstrels and the acrobats came to perform; it was the very centre of the life of the city—as was Silchester so was London.

Outside the Citadel the rude British town—if it was still a rude town—disappeared rapidly. The security of the place, strongly garrisoned, the extension of Roman manners, the introduction of Roman customs, dress, and luxuries gave a great impetus to the development of the City. The little ports of the rivers Walbrook and Fleet no longer sufficed for the shipping which now came up the river; if there were as yet no quays or embankments they were begun to be erected; behind them rose warehouses and wharves. The cliff began to be cut away; a steep slope took its place; its very existence was forgotten. The same thing has happened at Brighton, where, almost within the memory of living man, a low cliff ran along the beach. This embankment extended east and west—as far as the Fleet River, which is now Blackfriars, on the west, and what is now Tower Hill on the east. Then, the trade still increasing, the belt of ground behind the embankment became filled with a dense population of riverside people—boatmen, sailors, boat-builders, store-keepers, bargemen, stevedores, porters—all the people who belong to a busy mercantile port. As for the better sort, they lived round the Citadel, protected by its presence, in villas, remains of which have been found in many places.

The two things which most marked the Roman occupation were London Wall and Bridge. Of the latter we will speak in another place. The wall was erected at a time between A.D. 350 and A.D. 369—very near the end of the Roman occupation. This wall remained the City wall for more than a thousand years; it was rebuilt, repaired, restored; the scanty remains of it—a few fragments here and there—contain very little of the original wall; but the course of the wall was never altered, and we know exactly how it ran. There was first a strong river wall along the northern bank. There were three water gates and the Bridge gate; there were two land gates at Newgate and Bishopsgate. The wall was 3 miles and 205 yards long; the area enclosed was 380 acres. This shows that the population must have been already very large, for the Romans were not accustomed to erect walls longer than they could defend.