Plutarch, Otho
Bernadotte Perrin, Ed.

16. So he spake, and after resisting firmly those who tried to oppose and dissuade him, he ordered his friends to depart, as well as the men of senatorial rank who were present; to those who were absent he sent the same command, and wrote to the cities urging them to escort the travellers on their way with honour and in safety. [2] Then he sent for his nephew Cocceius, who was still a youth, and bade him be of good cheer and not fear Vitellius, whose mother and wife and children he had kept safe and cared for as though they were his own. He had desired, he said, to make him his son, but had put off the adoption, in order that the youth might share his power after he had prevailed, and not perish with him after he had failed. ‘And now, my boy,’ he said, ‘this is my last charge to thee; do not altogether forget, and do not too well remember, that thou hadst a Caesar for an uncle.’

[3] This done, after a little he heard tumult and shouting at his door. For as the men of senatorial rank were departing, the soldiers threatened to kill them if they did not remain, instead of forsaking their emperor. Once more, then, he went forth, since he feared for the men's safety. He was no longer gentle and suppliant, however, but stern of countenance, and looking angrily round upon the most turbulent of the soldiers, he made them go away submissively and in fear.