Cao Cao was a figure in the Eastern Han Dynasty, not in the Three Kingdoms period.

Cao Cao (155-0315,220) was born in Mengde, a lucky man and a small character, Asan, from Peiguoqiao County (now Bozhou, Anhui Province). At the end of the Eastern Han Dynasty, he was an outstanding politician, strategist, writer and calligrapher, and the founder of the Cao Wei regime in the Three Kingdoms.

Cao Cao served as the prime minister of the Eastern Han Dynasty and later named Wang Wei, which laid the foundation for the establishment of Cao Wei. After his death, posthumous title became King Wu. After his son Cao Pi proclaimed himself emperor, he was honored as Emperor Wu, with the temple name Mao.

At the end of the Eastern Han Dynasty, the world was in chaos. In the name of Emperor Wu of the Han Dynasty, Cao Cao conquered all directions, wiped out the separatist forces such as Er Yuan, Lu Bu, Liu Biao, Ma Chao and Han Sui at home, surrendered to Xiongnu, Wuhuan and Xianbei in the south, unified northern China, and implemented a series of policies to restore economic production and social order, expand reclamation, build water conservancy projects, reward farmers and mulberry, attach importance to handicrafts, resettle refugees and implement ".

Under Cao Cao's rule, the politics of the Yellow River valley gradually became clear, the economy gradually recovered, the class oppression was slightly alleviated, and the social atmosphere improved. Some measures taken by Cao Cao in the name of Han have positive effects.

References:

Baidu Encyclopedia, Cao Cao (founder of the Wei regime in the Three Kingdoms).