In succeeding times, in this island, Maximus, a man well-fitted for command, had he not aspired to power in defiance of his oath, assumed the purple, as though compelled by the army, and preparing immediately to pass over into Gaul, he despoiled the province of almost all its military force. Not long after also, one Constantine, who had been elected emperor on account of his name, drained its whole remaining warlike strength; but both being slain, the one by Theodosius, the other by Honorius, they became examples of the instability of human greatness. Of the forces which had followed them, part shared the fate of their leaders; the rest, after their defeat, fled to the continental Britons. Thus when the tyrants had left none but half-savages in the country, and, in the towns, those only who were given up to luxury, Britain, despoiled of the support of its youthful[19] population, and bereft of every useful art, was for a long time exposed to the ambition of neighbouring nations. For immediately, by an excursion of the Scots and Picts, numbers of the people were slain, villages burnt,[20] towns destroyed, and everything laid waste by fire and sword. Part of the harassed islanders, who thought anything more advisable than contending in battle, fled for safety to the mountains; others, burying their treasures in the earth, many of which are dug up in our own times, proceeded to Rome to ask assistance. The Romans, touched with pity, and deeming it above all things important to yield succour to their oppressed allies, twice lent their aid, and defeated the enemy. But at length, wearied with the distant voyage, they declined returning in future; bidding them rather themselves not degenerate from the martial energy of their ancestors, but learn to defend their country with spirit, and with arms. They accompanied their advice with the plan of a wall, to be built for their defence; the mode of keeping watch on the ramparts; of sallying out against the enemy, should it be necessary, together with other duties of military discipline. After giving these admonitions, they departed, accompanied by the tears of the miserable inhabitants; and Fortune, smiling on their departure, restored them to their friends and country. The Scots, learning the improbability of their return, immediately began to make fresh and more frequent irruptions against the Britons; to level their wall, to kill the few opponents they met with, and to carry off considerable booty; while such as escaped fled to the royal residence, imploring the protection of their sovereign. [Sidenote: [A.D. 447.] REIGN OF VORTIGERN.]