Trajan succeeded his adoptive father Nerva as Roman emperor; the Roman Empire reached its maximum extent under his rule. AD 98: AD 98 (XCVIII) was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Traianus. The denomination AD 98 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. January 27, 98. Wiki link