Res Gestae

In those same days Apollinaris, son-in-law of Domitianus, who a short time before had been in charge of Caesar’s palace, being sent to Mesopotamia by his father-in-law, inquired with excessive interest among the companies of soldiers whether they had received any secret messages from Gallus which indicated that he was aiming higher; but when he heard what had happened at Antioch, he slipped off through Lesser Armenia and made for Constantinople, but from there he was brought back by the guards and kept in close confinement.