The principate came to a formal end under the reign of

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The principate ended and the dominate period began with the reign of Diocletian, who introduced significant reforms in the administration and organization of the Roman Empire, including dividing it into two halves with two co-emperors. Augustus was the first Roman emperor and established the principate, while Constantine was a later emperor who converted to Christianity and is known for initiating the shift towards Christianity in the Roman Empire. Ptolemy and Cleopatra were rulers of Egypt before and during the Roman Empire and are not directly related to the end of the principate.

The Principate Came to a Formal End Under the Reign