the roman empire reached its greatest extent during the
During the reign of Trajan
Roman Empire
Rome reached its greatest territorial expanse during the reign of Trajan (98–117 AD).
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Roman Empire [SEP] Introduction
The first two centuries of the Empire saw a period of unprecedented stability and prosperity known as the Pax Romana ("Roman Peace"). Rome reached its greatest territorial expanse during the reign of Trajan (98–117 AD). A period of increasing trouble and decline began with the reign of Commodus (177–192). In the 3rd century the Empire underwent a crisis that threatened its existence, as the Gallic Empire and Palmyrene Empire broke away from the Roman state, and a series of short-lived emperors, often from the legions, led the empire. The empire was reunified under Aurelian (). In an effort to stabilize it, Diocletian set up two different imperial courts in the Greek East and Latin West in 286.