Suetonius,
The Lives of the Twelve Caesars…
“ Moreover, that he was then encouraged to despise life by the example of a common soldier, who bringing news of the defeat of the army, and finding that he met with no credit, but was railed at for a liar and a coward, as if he had run away from the field of battle, fell upon his sword at the emperor's feet; upon the sight of which, my father said that Otho cried out, "that he would expose to no farther danger such brave men, who had deserved so well at his hands." ”
