History of the Roman Empire
Theodosius was the last Emperor who ruled over the whole Empire. After his death in 395, he gave the two halves of the Empire to his two sons Arcadius and Honorius; Arcadius became ruler in the East, with his capital in Constantinople, and Honorius became ruler in the West, with his capital in Milan and later Ravenna. The Roman state would continue to have two different emperors with different seats of power throughout the 5th century, though the Eastern Romans considered themselves to be the only ones who were fully Roman. Latin was used in official writings as much as, if not more than, Greek and the two halves were nominally, culturally and historically, if not politically, the same state.
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.