We have no distinct mention of the Caledonians again until the reign of Commodus, when, about the year 183, these troublesome barbarians appear to have broken through the northern wall, slain the general in command of the Roman forces, and pillaged the lowland country beyond. They were, however, driven back by Ulpius Marcellus, who succeeded by prudent management in maintaining peace for a number of years. In the beginning of the reign of Severus, however, the Caledonians again broke out, but were kept in check by Virius Lupus, who appears to have bribed rather than beaten the barbarians into conformity. The irrepressible Highlanders again broke out about the year 207, and this time the Emperor Severus himself, notwithstanding his bad health and old age, came from Rome to Britain, determined apparently to “stamp out” the rebellion. On hearing of his arrival the tribes sent deputies to him to negotiate for peace, but the emperor, who was of a warlike disposition, and fond of military glory, declined to entertain any proposals. After making the necessary preparations, Severus began his march to the north in the year 208. He traversed the whole of North Britain, from the wall of Antoninus to the very extremity of the island, with an immense army. The Caledonians avoided coming to a general engagement with him, but kept up an incessant and harassing warfare on all sides. He, however, brought them to sue for peace; but the honours of this campaign were dearly earned, for fifty thousand of the Romans fell a prey to the attacks of the Caledonians, to fatigue, and to the severity of the climate. The Caledonians soon disregarded the treaty which they had entered into with Severus, which conduct so irritated him that he gave orders to renew the war, and to spare neither age nor sex; but his son, Caracalla, to whom the execution of these orders was intrusted, was more intent in plotting against his father and brother than in executing the revengeful mandate of the dying emperor, whose demise took place at York on the 4th February, 211, in the sixty-sixth year of his age, and in the third year of his administration in Britain. It is in connection with this invasion that we first hear of the Meats or Mæatæ, who are mentioned by Dion Cassius, or rather his epitomiser Xiphiline, and who are supposed by some to have inhabited the country between the two walls, while others think it more likely that they were a part of the Caledonians, and inhabited the district between the Grampians and the wall of Antonine. We shall not, however, enter into this question here, but endeavour, as briefly as possible, to record all that is known of the remaining transactions of the Romans in the north of Scotland, reserving other matters for the next chapter.