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.
Romulus Augustulus
Odoacer advanced on Ravenna, capturing the city and the young emperor after the short and decisive Battle of Ravenna. Romulus was compelled to abdicate the throne on 4 September 476. This act has been cited as the end of the Western Roman Empire, although Romulus' deposition did not cause any significant disruption at the time. Rome had already lost its hegemony over the provinces, Germanic peoples dominated the Roman army, and Germanic generals like Odoacer had long been the real powers behind the throne. Italy would suffer far greater devastation in the next century when Emperor Justinian I reconquered it in the Gothic War.