When did Odoacer depose Romulus Augustulus and what happened to the imperial regalia?
Odoacer deposed Romulus Augustulus in 476 AD. He sent the imperial regalia to Constantinople and acknowledged Emperor Zeno as his overlord.
Short answers, pulled from the story.
Odoacer deposed Romulus Augustulus in 476 AD. He sent the imperial regalia to Constantinople and acknowledged Emperor Zeno as his overlord.
Sultan Mehmed II declared himself Kayser-i Rum or Caesar of the Romans after conquering Constantinople in 1453. He justified this title by right of conquest consistent with Byzantine imperial ideology.
Pope Leo III crowned Charlemagne Emperor on Christmas Day 800. This coronation explicitly aimed to establish continuity with the Eastern Roman Empire.
The empire never used the expression Byzantine Empire internally until the fall of Constantinople. It kept calling itself the Roman Empire, Empire of the Romans, or Romania throughout its history.
Ivan IV cemented his title as Tsar of All Rus in 1547. He had married Sophia Palaiologina niece of the last Byzantine Emperor Constantine XI in 1472.
The effort ended in disaster during the Greco-Turkish War spanning 1919 to 1922. The Megali Idea developed shortly after Greek independence to recreate the Byzantine Empire as an ethnic-Greek polity with capital in Constantinople.