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Vespasian, the emperor who ruled during Pliny's lifetime, ascended to the throne in 69 AD. His reign marked the beginning of the Flavian dynasty and a period of stability and prosperity for the Roman Empire. Vespasian's rule was characterized by his focus on administrative reforms, infrastructure improvements, and military campaigns that expanded the empire's borders. He is also credited with restoring the Colosseum and constructing the Baths of Titus.