By 285 CE the Roman Empire became expanded so extensively that it was no longer possible to rule all the territories from the central foundation of Rome. Diocletian, a powerful Roman general, gained control and proclaimed himself the unique dictator. Emperor Diocletian distributed the federation into halves by the Eastern Empire ruled out of Byzantium (later Constantinople) and the Western Empire administered from Rome.
Western roman empire was termed as the western provinces which founded in the Roman empire. They had coequal courts which divided the governance between the Eastern and Western provinces whereby in those separate courts they had imperial succession.
Both Eastern and Western Roman empires they had a description which was modern which described each political entities.
The two separated empires, Romans did not value them as separated but as a single polity which was governed by imperial courts which were separate in expediency of administrative.
