when did the roman empire split in two
Western Roman Empire Though Marcellinus does not refer to the Empire as a whole after 395, only referring specifically to its separate halves, he clearly identifies the term "Roman" as applying to the Empire as a whole. When using terms such as "us", "our generals" and "our emperor", Marcellinus distinguished both divisions of the Empire from outside foes such as the Sasanian Persians and the Huns.[139] This view is consistent with the knowledge that contemporary Romans of the fourth and fifth century continued to consider the Empire as a single unit, though more often than not with two rulers instead of one.[83] Though it was the first time the position was divided geographically, the concept of there being more than one emperor at a time was not unprecedented even before Diocletian and the Tetrarchy with there having been several periods where there were more than one co-emperor, such as with Caracalla and Geta 210-211 AD.[141]
Roman Republic The Roman Republic (Latin: Res publica Romana; Classical Latin: [ˈreːs ˈpuːb.lɪ.ka roːˈmaː.na]) was the era of classical Roman civilization beginning with the overthrow of the Roman Kingdom, traditionally dated to 509 BC, and ending in 27 BC with the establishment of the Roman Empire. It was during this period that Rome's control expanded from the city's immediate surroundings to hegemony over the entire Mediterranean world.