Quintus Petillius Cerialis

"[3] His first important assignment was as legate of Legio IX Hispana (Ninth Iberian Legion) in the Roman province of Britannia, under governor Gaius Suetonius Paulinus.

"The victorious enemy met Petilius Cerialis, commander of the ninth legion, as he was coming to the rescue, routed his troops, and destroyed all his infantry.

"[4] As the son in law of Vespasian, being the husband of Domitilla the Younger, Cerialis was made a hostage by Vitellius in 69, during the civil wars of the Year of Four Emperors.

In 74, Cerialis left Britain; a military diploma dated 21 May 74 attests he was consul a second time, with Titus Clodius Eprius Marcellus as his colleague.

[9] According to the 1911 Encyclopædia Britannica, "Tacitus says that he was a bold soldier rather than a careful general, and preferred to stake everything on the issue of a single engagement.