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.
The Last Legion
In the film, Romulus told his mother that "during the last five years, there have been five emperors and all of them were murdered". The five Roman Emperors Romulus mentioned were possibly Libius Severus (461–465), Anthemius (467–472), Olybrius (472), Glycerius (473–474), and Julius Nepos (474–475). While Libius Severus and Anthemius were in fact murdered by the Germanic-Roman general Ricimer, Olybrius died of an illness and both Glycerius and Nepos were deposed. Glycerius was forced to surrender to Nepos in 474, to which Nepos spared his life and sent him into exile possibly in Dalmatia. Nepos ruled over the Western Empire for thirteen months before he was deposed by the Roman commander Orestes and was forced to flee to Dalmatia.