The dating available relies entirely on internal evidence, which is not certain, but offers some degree of preponderance. In Book X Curtius digresses to give an encomium on blessings of peace under empire, citing the Roman Empire with the implication of contemporaneity. In essence he reasserts the policy of Augustus, which casts the empire as the restoration of monarchy for the suppression of the civil wars fomented by the contention of powerful noblemen vying for control of the Republic. Curtius' glowing endorsement of the policy dates him to the Roman Empire.