 This is indeed the case in discussing the important poets in the late Han and early Six Dynasties period, including the famous general Cao Cao (155–220), who may be reckoned in this period, although actually beginning his career in the Later/Eastern Han era.That is, the final years at the End of the Han Dynasty and during which the Cao family was rising, or risen, to prominence were known as the "Jian'an" era (196–220).The Jian'an was technically a Han dynasty Chinese era name referring approximately to the years 196–220, during the nominal reign of Emperor Xian of Han, during the End of the Han dynasty.