Dominate
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The Dominate was a period traditionally used to describe the Roman Empire beginning with the reign of Emperor Diocletian. The term Dominate is now rarely used as an analytical model in modern scholars
Theodor Mommsen (1817—1903)
Principate
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The Principate was the early period of the Roman Empire, beginning with the reign of Augustus as the first Roman emperor in 27 BC and conventionally lasting until the late third century, often linked
Dominate
…as an analytical model in modern scholarship. Proposed in the 19th-century by the German scholar Theodor Mommsen, he contrasted it with the earlier Principate established by Augustus in 27 BC, which he interpreted as a system in which imperial authority was formally embedded within Roman Republican institutions…
Augustus depicted as pontifex maximus in the Via Labicana Augustus statue, now in the National Museum of Rome, Italy
Principate under Augustus