History of the East–West Schism
Disunion in the Roman Empire further contributed to disunion in the Church. The Emperor Diocletian famously divided the administration of the eastern and western portions of the Empire in the early 4th century, though subsequent leaders (including Constantine) aspired to and sometimes gained control of both regions. Theodosius the Great, who established Nicene Christianity as the official religion of the Roman Empire (see Edict of Thessalonica), was the last Emperor to rule over a united Roman Empire. Following his death in 395, the division into western and eastern halves, each for a few decades still under its own Emperor, was never reunited.
Ballot laws of the Roman Republic
After the Final War ended in 30 BC, Octavius controlled all of Rome. He concentrated the powers of consul, tribune, and pontifex maximus in his own hands, ruling as an autocrat in all but name. Octavius, renamed Augustus in 27 BC, would be the first Roman emperor. These events marked the end of the Republic and the beginning of the Principate. Although the assemblies continued to meet during the Principate, Augustus removed their judicial role and began transferring their electoral power to the Senate; his successor Tiberius would completely end the electoral role of the assemblies. The assemblies continued to have legislative powers, but even under Augustus this power was exercised more and more rarely. Rome became an autocratic state in all but name, and the ballot laws became irrelevant to the running of the state.