My favorite Caracalla story is him trying to kill his dad in full fucking view of the army, and pussing out when Septimius Severus turned around.

Then his dad calls him into his tent in private, tosses him a sword, and basically tells Caracalla if he wants to play assassin, now’s the time - and Caracalla pusses out again.

Infinite viciousness against the helpless, but couldn’t look a man in the eyes as he killed him. What a piece of work.

Here we are - from Cassius Dio:

On another occasion, when both were riding forward to meet the Caledonians, in order to receive their arms and discuss the details of the truce, Antoninus [Caracalla] attempted to kill his father outright with his own hand. They were proceeding on horseback, Severus also being mounted, in spite of the fact that he had somewhat strained his feet as the result of an infirmity, and the rest of the army was following; the enemy’s force were likewise spectators. 4 At this juncture, while all were proceeding in silence and in order, Antoninus reined in his horse and drew his sword, as if he were going to strike his father in the back. But the others who were riding with them, upon seeing this, cried out, and so Antoninus, in alarm, desisted from his attempt. Severus turned at their shout and saw the sword, yet he did not utter a word, but ascended the tribunal, finished what he had to do, and returned to headquarters. 5 Then he summoned his son, together with Papinian and Castor, ordered a sword to be placed within easy reach, and upbraided the youth for having dared to so such a thing at all and especially for having been on the point of committing so monstrous a crime in the sight of all, both the allies and the enemy. 6 And finally he said: “Now if you really want to slay me, put me out of the way here; for you are strong, while I am an old man and prostrate. For, if you do not shrink from the deed, but hesitate to murder me with your own hands, there is Papinian, the prefect, standing beside you, whom you can order to slay me; for surely he will do anything that you command, since you are virtually emperor.” 7 Though he spoke in this fashion, he nevertheless did Antoninus no harm, and that in spite of the fact that he had often blamed Marcus for not putting Commodus quietly out of the way and that he had himself often threatened to act thus toward his son. Such threats, however, were always uttered under the influence of anger, whereas on the present occasion he allowed his love for his offspring to outweigh his love for his country; and yet in doing so he betrayed his other son, for he well knew what would happen.