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Quintus Petilius Cerialis Caesius Rufus (born ca. 30 died after 83) was a Roman general and administrator who served in Britain during Boudica's rebellion and who went on to participate in the civil wars after the death of Nero. He later defeated the rebellion of Julius Civilis and returned to Britain as its governor.
His name suggests that he was an adopted son of a Caesius family into the Petilii. His elder brother may have been Caesius Nasica.