The dates of Severus’ campaign are only obscurely indicated, but it seems probable that by the year 210 the subjection of the Caledonians had been apparently completed. Severus, accompanied by Caracalla and his staff, was riding on horseback, notwithstanding his physical infirmity, towards a certain place of meeting which had been appointed for the barbarians, that they might surrender their swords and swear fidelity to the empire. Caracalla, riding behind him, drew his sword and made his horse rear and prance, intending, apparently, to be brought into collision with his father and thus to kill him by apparent misadventure. A warning shout from some member of the staff caused the emperor to look round and the parricidal design was foiled. Severus said nothing, but rode calmly on, took his place on the tribunal and went through the ceremony that had been arranged. He then sent for his son and two of his chief ministers (one of them the great lawyer Papinian), having ordered that a naked sword should be placed in the middle of the tent. He sternly rebuked his son for the impious deed which he had meditated in the sight of the allies and the enemies of Rome, and then, changing his tone, said: “If you still desire to slay me, here is the sword, draw it and destroy me. Or, since I have associated you with me in the empire, give your orders to Papinian and let him be my executioner. You are young and strong: I am old and shall lay me down to rest without a sigh.” The invitation was not accepted, for Caracalla shrank now from the guilt of manifest parricide. But the father’s words revealed too plainly the bitterness of his soul. Many cruelties and much needless bloodshed had marked his own ascent to power, but they were surely all avenged by the misery of that day in the land of the Caledonians.