On the other hand there has been no modern investigation of those foundations of the White Tower where, if anywhere, Roman work might be expected. This exhausts the direct evidence. In sciences such as geology or the criticism of Sacred Books evidence to this extent would be ample to overset the firmest traditions or the most self-evident conclusion of common human experience. But history is bound to a greater caution, and it must be reluctantly admitted that the two coins, the ingot and the bit of stone are insufficient to prove the existence of a Roman fortress.
Leaving such material and direct evidence we have the tradition, which is a fairly strong one, of Roman fortification here, and we have the analogy, so frequently occurring in space and time throughout the history and the area of Western Europe, that Gaul reproduces Rome. What the Conqueror saw (it might be vaguely argued) to be the strategical position for London, that a Roman emperor would have seen. But against this argument from tradition, which is fairly strong, and that argument from analogy, which is weak, we have other and contrary considerations.
Rome even in her decline did not build her citadels outside the walls: that was a habit which grew up in the Dark and early Middle Ages, and was attached to the differentiation between the civic and military aspects of the State.
Again, Roman fortification of every kind is connected with earthworks. So far as we can tell from recorded history the ditch round the Tower was not dug till the end of the twelfth century. Finally, there is this strong argument against the theory of a Roman origin to the Tower that had such a Roman fortress existed an extension of the town would almost certainly have gathered round it.
One of the features of the break-up of Roman society was the enormous expansion of the towns. We have evidence of it on every side and nowhere more than in Northern Africa. This expansion took place everywhere, but especially and invariably in the presence of a garrison, and indeed the military conditions of the fourth century, with its cosmopolitan and partially hereditary army, fixed in permanent garrisons and forming as it were a local caste, presupposed a large dependent civilian population at the very gates of the camp or stronghold. Thus you have the Palatine suburb to the south of Lutetia right up against the camp, and Verecunda just outside Lamboesis. Now there is nothing of the sort in the neighbourhood of the Tower. It seems certain that from the earliest times London ended here cleanly at the wall, and that except along the Great Eastern Road the neighbourhood of the Tower was agricultural land.
How then could a tradition have arisen with regard to Roman occupation? It is but a conjecture, though a plausible one, that when the pirate raids grew in severity this knoll down stream was fortified, while still the ruling class was Latin speaking and while still the title of Cæsar was familiar, whether before or after the withdrawal of the Legions. If this were the case, then, on the analogy of other similar sites, one may imagine something like the following: that in the Dark Ages the masonry was used as a quarry for other constructions, that the barbarians would occasionally stockade the site, though not permanently, and only for the purposes of their ephemeral but constant quarrels; and one may suggest that when the barbaric period was ended, by the landing of William's army, the place was still, by a tradition now six hundred years old, a public area under the control of the Crown and one such as would lend itself to the design of a permanent fortification. William, finding it in this condition, erected upon it the great keep which was to be the last of his fortifications along the line of the river, and the pivot for the control of London.
This keep is of course the White Tower, which still impresses even our generation with the squat and square shoulders of Norman strength. It and Ely are the best remaining expressions of the hardy little men, and it fills one, as does everything Norman, from the Tyne to the Euphrates, with something of awe. This building, the White Tower, is the Tower itself; the rest is but an accretion, partly designed for defence, but latterly more for habitation. Its name of the "White" Tower is probably original, though we do not actually find the term "La Blaunche Tour" till near the middle of the fourteenth century. The presumption that it is the original name is founded upon a much earlier record—namely, that of 1241, in which not only is it ordered that the tower be repainted white, but in which mention is also made that its original colour had been "worn by the weather and by the long process of time." Such a complaint would take one back to the twelfth century, and quite probably to the first building of the Keep. The object of whitening the walls of the Tower is again explicable by the very reasonable conjecture that it would so serve as a landmark over the long, flat stretches of the lower river. It was the last conspicuous building against the mass of the great town, and there are many examples of similar landmarks used at the head of estuaries or sea passages. When these are not spires they are almost invariably white, especially where they are so situated as to catch the southern or the eastern sun.
The exact date at which the plan was undertaken we do not know, but it is obviously one with the scheme of building Windsor, and must date from much the same period. The order to build was given by the Conqueror to the Bishop of Rochester, Gundulph. Now Gundulph was not promoted to the See of Rochester till 1077. Exactly twenty years later, in 1097, the son of the Conqueror built the outer wall. The Keep was then presumed to be completed, and at some time during those twenty years it must have been begun, probably about 1080. That which we have seen increasing, the military importance of Windsor, diminished the military importance of the Tower, until, with the close of the Middle Ages, it had become no more than a prison. It was not indeed swamped by the growth of the town, as was its parallel the Louvre, but the increase of wealth (and therefore of the means of war), coupled with the correspondingly increased population, made both urban fortresses increasingly difficult to hold as mediæval civilisation developed.
The whole history of the Tower is the history of military misfortune, which grows as London expands in numbers and prosperity. It probably held out under Mandeville when the Londoners (who were always the allies of the aristocracy against the national government) besieged it under the civil wars of Stephen; but even so there was bad luck attached to it, for when Mandeville was taken prisoner he was compelled to sign its surrender. Within a generation Longchamp again surrendered it to the young Prince John; he was for the moment leading the aristocracy, which, when it was his turn to reign, betrayed him. It was surrendered to the baronial party by the King as a trust or pledge for the execution of Magna Charta, and though it was put into the hands of the Archbishop, who was technically neutral, it was from that moment the symbol of a successful rebellion, as it had already proved to be in the past and was to prove so often again.
It was handed over to Louis of France upon his landing, and during the next reign almost every misfortune of Henry III. is connected with the Tower. He was perpetually taking refuge in it, holding his Court in it: losing it again, as the rebels succeeded, and regaining it as they failed. This long and unfortunate tenure of his is illumined only by one or two delightful phrases which one cannot but retain as one reads. Thus there is the little written order, which still remains to us for the putting of painted windows into the Chapel of St John, the northern one of which was to have for its design "some little Mary or other, holding her Child"—"quandam Mariolam tenenten puerum suum." There is also a very pleasing legend in the same year, 1241, when the fall of certain new buildings was ascribed to the action of St. Thomas, who was seen by a priest in a dream upsetting them with his crozier and saying that he did this "as a good citizen of London, because these new buildings were not put up for the defence of the realm but to overawe the town," and he added this charming remark: "If I had not undertaken the duty myself St. Edward or another would have done it."