He formed plots and conspiracies against his father's authority; he raised mutinies in the army; he headed riots; and he was finally detected in a plan for actually assassinating his father.

Severus, when he discovered this last enormity of wickedness, sent for his son to come to his imperial tent.
He laid a naked sword before him, and then, after bitterly reproaching him with his undutiful and ungrateful conduct, he said, "If you wish to kill me, do it now.

Here I stand, old, infirm, and helpless.

You are young and strong, and can do it easily.

I am ready.