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In page Vespasian:

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Vespasian distrusted philosophers in general. It was the talk of philosophers, who liked to glorify the Republic, that provoked Vespasian into reviving the obsolete penal laws against this profession as a precautionary measure.[citation needed] Only Helvidius Priscus was put to death after he repeatedly affronted the Emperor with studied insults which Vespasian initially tried to ignore.[2] The philosopher Demetrius was banished to an island and when Vespasian heard that Demetrius was still criticizing him, he sent the exiled philosopher the message: "You are doing everything to force me to kill you, but I do not slay a barking dog."[3]