Seven writers in Jian 'an period (196 ~ 220). Include Kong Rong, Chen Lin, RoyceWong, Xu Gan, Ruan Yu, Angelababy and Liu Zhen. The name of "seven sons" began with Cao Pi's Dian Lun Paper: "Today's literati include Lu Kongju, Guangling Chen Zhang, Wang Shen, Beihai Xu, Liu Chen Ruan Yu Yuan Yu, Runan Xingyang Delian, and Dongping businessman Liu Zhen. People who have given birth to seven children have nothing to learn and nothing to write. "These seven people generally represent outstanding writers except Cao Shi and his son during the Jian 'an period, so the theory of' seven sons' has been widely recognized by later generations. Except Kong Rong and Cao Cao, the other six ethnic groups had different experiences, but they all suffered from the rebellion at the end of Han Dynasty. Later, when he defected to Cao Cao, his position changed and he lived a stable and prosperous life. They regard Cao Cao as their confidant and want to rely on him to do something. Therefore, their poems have many similarities with Cao Shi's father and son. Because the seven sons of Jian 'an once lived together in Weiduye (now Anyang North), it is also called "the seven sons of Nakano".