We should be startled if we were quietly reading a prosaic modern novel, and somewhere in the middle it turned without warning into a fairy tale. We should be surprised if one of the spinsters in _Cranford_, after tidily sweeping the room with a broom, were to fly away on a broomstick. Our attention would be arrested if one of Jane Austen's young ladies who had just met a dragoon were to walk a little further and meet a dragon. Yet something very like this extraordinary transition takes place in British history at the end of the purely Roman period. We have to do with rational and almost mechanical accounts of encampment and engineering, of a busy bureaucracy and occasional frontier wars, quite modern in their efficiency and inefficiency; and then all of a sudden we are reading of wandering bells and wizard lances, of wars against men as tall as trees or as short as toadstools. The soldier of civilization is no longer fighting with Goths but with goblins; the land becomes a labyrinth of faerie towns unknown to history; and scholars can suggest but cannot explain how a Roman ruler or a Welsh chieftain towers up in the twilight as the awful and unbegotten Arthur. The scientific age comes first and the mythological age after it. One working example, the echoes of which lingered till very late in English literature, may serve to sum up the contrast. The British state which was found by Caesar was long believed to have been founded by Brutus. The contrast between the one very dry discovery and the other very fantastic foundation has something decidedly comic about it; as if Caesar's "Et tu, Brute," might be translated, "What, _you_ here?" But in one respect the fable is quite as important as the fact. They both testify to the reality of the Roman foundation of our insular society, and show that even the stories that seem prehistoric are seldom pre-Roman. When England is Elfland, the elves are not the Angles. All the phrases that can be used as clues through that tangle of traditions are more or less Latin phrases. And in all our speech there was no word more Roman than "romance." The Roman legions left Britain in the fourth century. This did not mean that the Roman civilization left it; but it did mean that the civilization lay far more open both to admixture and attack. Christianity had almost certainly come to Britain, not indeed otherwise than by the routes established by Rome, but certainly long before the official Roman mission of Gregory the Great. It had certainly been largely swamped by later heathen invasions of the undefended coasts. It may then rationally be urged that the hold both of the Empire and its new religion were here weaker than elsewhere, and that the description of the general civilization in the last chapter is proportionately irrelevant. This, however, is not the chief truth of the matter.