Domitian, two years before he was assassinated by some of his servants whom he was about to put to death, grew suspicious of an aged and honorable senator, Cocceius Nerva, who had been twice consul, and whom he had sent into exile, first to Tarenturn, and then in Gaul, preparatory, probably, to a worse fate.

To this victim of proscription application was made by the conspirators who had just got rid of Domitian, and had to get another emperor.

Nerva accepted, but not without hesitation, for he was sixty-four years old; he had witnessed the violent death of six emperors, and his grandfather, a celebrated jurist, and for a long while a friend of Tiberius, had killed himself, it is said, for grief at the iniquitous and cruel government of his friend.
The short reign of Nerva was a wise, a just, and a humane, but a sad one, not for the people, but for himself.

He maintained peace and order, recalled exiles, suppressed informers, re-established respect for laws and morals, turned a deaf ear to self-interested suggestions of vengeance, spoliation, and injustice, proceeding at one time from those who had made him emperor, at another from the Praetorian soldiers and the Roman mob, who regretted Domitian just as they had Nero.

But Nerva did not succeed in putting a stop to mob-violence or murders prompted by cupidity or hatred.