The Picts--who on this occasion are mentioned by Ammianus Marcellinus[18] as being divided into two nations, the _Dicaledones_ and _Vecturiones_--and Scots, being joined by the Attacots, “a warlike race of men,” and the Saxons, numbers of whom appear at this early period to have settled in Britain, made another attack on the Roman provinces in the year 364, on the accession of Valentinian. These appear to have made their way as far south as London, and it required all the valour and skill of Theodosius the Elder, father of the emperor of that name, who was sent to Britain in the year 367, to repel this aggression, and to repair the great ravages committed by the barbarians. The next outbreak occurred about the year 398, when the Picts and Scots again broke loose and ravaged the provinces, being repelled by a legion sent over by the great Stilicho, in answer to the petition of the helpless provincials for assistance. In the beginning of the fifth century the enervated Romanized Britons again appear to have been subjected to the tender mercies of their wicked northern neighbours; and in reply to their cry for help, Honorius, in 416, sent over to their relief a single legion, which drove back the intruders. The Romans, as is well known, engrossed by overwhelming troubles nearer home, finally abandoned Britain about the year 446, advising the inhabitants, who were suffering from the ravages of the Picts and Scots, to protect themselves by retiring behind and keeping in repair the wall of Severus. Such is a brief account of the transactions of the Romans in Britain so far as these were connected with the Highlands of Scotland. That energetic and insatiable people doubtless left their mark on the country and its inhabitants south of the Forth and Clyde, as the many Roman remains which exist there at the present day testify. The British provincials, indeed, appear in the end to have been utterly enervated, and, in the worst sense, Romanized, so that they became an easy prey to their Saxon helpers. It is quite evident, however, that the inhabitants of Caledonia proper, the district beyond the wall of Antonine, were to a very slight extent, if at all, influenced by the Roman invasion. Whether it was from the nature of the people, or from the nature of the country which they inhabited, or from both combined, they appear to have been equally impervious to Roman force and Roman culture. The best services that their enemies rendered to the Caledonians or Picts were that they forced them to unite against the common foe thus contributing towards the foundation of a future kingdom; and that they gave them a training in arms such as the Caledonians could never have obtained, had they not been brought into collision with the best-trained soldiers of the world in their time.