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I don't have context provided about the 2nd century to base an overview on. To write an accurate overview using only the information you've specified, I would need you to provide the relevant context about the 2nd century.
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Map of the world in 100 AD. Map of the world in 200 AD, at the end of the second century.
The 2nd century is the period from AD 101 (represented by the Roman numerals CI) through AD 200 (CC) in accordance with the Julian calendar. It is considered part of the Classical era, epoch, or historical period.