Text: The situation stabilized with Vespasian, and the second century A.D. is often considered the golden age of the empire (Gibbon himself says that the time of Marcus Aurelius--late second century--was the best time to live of all in history).
Entailment: The time of Marcus Aurelius is claimed by Gibbon to be the best time to live of all in history.
Contradiction: The situation got out of hand with Vespasian.