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.
Marcus Aurelius
Marcus Aurelius ( or ; ; 26 April 121 – 17 March 180), called the Philosopher, was Roman emperor from . He ruled the Roman Empire with his adoptive brother, Lucius Verus, until Lucius' death in 169. He was the last of the rulers traditionally known as the Five Good Emperors. He is also seen as the last emperor of the Pax Romana, an age of relative peace and stability for the Empire.