Date in history are marked with CE to denote Christ Era. Hence, the following are within Christ Era.
The new Eastern Roman Empire capital is renamed Constantinople after Emperor Constantine. 324 Ce
The Pax Romana begins 27 BCE
Odoacer deposes Emperor Romulus Augustus ending the Roman Empire in the west. 476 CE
Alaric, a Visigoth, invades western Rome.
The Pax Romana ends. 410 CE
The Emperor Nerva, the first of the Five Great Emperors, takes the throne. 96 CE
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