Roman emperor
The Western Roman Empire collapsed in the late 5th century. Romulus Augustulus is often considered to be the last emperor of the West after his forced abdication in 476, although Julius Nepos maintained a claim recognized by the Eastern Empire to the title until his death in 480. Following Nepos' death, the Eastern Emperor Zeno abolished the division of the position and proclaimed himself as the sole Emperor of a reunited Roman Empire. The Eastern imperial lineage continued to rule from Constantinople ("New Rome"); they continued to style themselves as Emperor of the Romans (later βασιλεύς Ῥωμαίων in Greek), but are often referred to in modern scholarship as Byzantine emperors. Constantine XI Palaiologos was the last Roman emperor in Constantinople, dying in the Fall of Constantinople to the Ottomans in 1453.
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.