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List of Roman emperors - Wikipedia
Emperor | Definition, Examples, & History | Britannica
Emperor - Wikipedia
Nero | Biography, Claudius, Rome, Burning, Fate, …
Augustus - Caesar, Emperor & Accomplishments | HISTORY
Roman Emperor - World History Encyclopedia
Charlemagne | Biography, Accomplishments, Children, & Facts
What You Need to Know About China's Terra-Cotta Warriors and …
Hirohito - Wikipedia
Constantine I - World History Encyclopedia