Otho (16.1-16.2)

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.

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.