Quintus Petillius Cerialis Caesius Rufus, otherwise known as Quintus Petillius Cerialis, was a Roman general and administrator who served in Britain during Boudica's rebellion and went on to participate in the civil wars after the death of Nero. He later crushed the rebellion of Julius Civilis and returned to Britain as its governor.

Roman Britain was the territory that became the Roman province of Britannia after the Roman conquest of Britain, consisting of a large part of the island of Great Britain. The occupation lasted from AD 43 to AD 410.