Having completed this work, and left the province thus once more protected, with the additional security of the occupation by Roman outposts of the ceded territory beyond the wall, he returned to York, leaving behind him Antoninus, whom he was apparently not desirous to retain with him, in consequence of an attempt he had made upon his life in presence of the army, while conferring with the Caledonians regarding the treaty of peace, in charge of the frontier. He had not remained long at York before the Mæatæ again revolted, and were joined by the Caledonians, and he was only prevented from recommencing a war of extermination by his death, which took place at York in the year 211. Antoninus, as soon as he became, by the death of his father, possessed of the imperial power, being desirous to disembarrass himself of everything that could interfere with his perfect enjoyment of it, terminated the war by making peace with the barbarian natives, and, receiving pledges of their fidelity, left the frontier of which he had remained in charge. Thus terminated the most formidable attempt which had been made to subjugate the inhabitants of the barren regions of the north since the campaigns of Agricola; and although the expedition was more successful, inasmuch as the army penetrated farther into the country, it was equally unproductive of permanent result, and was not marked by the same brilliant feature of the defeat of the entire force of the hostile tribes in a pitched battle. [Sidenote: A.D. 287. Revolt of Carausius; Britain for ten years independent.]