Xin Xianying (191–269) was a Chinese noblewoman, aristocrat and advisor who lived during the Three Kingdoms period. She was a daughter of Xin Pi, an official of the state of Cao Wei. The only extant historical source about her life is her biography written by her maternal grandson, Xiahou Zhan (夏侯湛), who was a notable scholar and official of the Jin dynasty. She is best known for giving advice to her family members and relatives during significant events in the history of Cao Wei such as the Incident at the Gaoping Tombs and Zhong Hui's Rebellion. Family background Xin Xianying's ancestral home was in Yangzhai County (陽翟縣), Yingchuan Commandery (潁川郡), which is around present-day Yuzhou, Henan. Her ancestors were actually from Longxi Commandery (隴西郡; around present-day Dingxi, Gansu), but they migrated to Yingchuan Commandery during the Jianwu era (25–56 CE) of the reign of Emperor Guangwu in the early Eastern Han dynasty. Xin Xianying's father, Xin Pi, served as an official under the warlord Cao Cao, who controlled the central government and the figurehead Emperor Xian in the final decades of the Eastern Han dynasty. After the fall of the Eastern Han, Xin Pi continued serving in the Cao Wei state during the Three Kingdoms period and his highest appointment was Minister of the Guards (衛尉). Xin Xianying had a younger brother, Xin Chang (辛敞), who also served as an official in Wei. Xin Xianying married Yang Dan (羊耽), the youngest son of the Eastern Han dynasty official Yang Xu (羊續). Yang Dan, who was from Taishan Commandery (泰山郡; around present-day Tai'an, Shandong), served as the Minister of Ceremonies (太常) in the Wei central government. Yang Dan's nephews and nieces include Yang Hu and Yang Huiyu (children of his brother Yang Dao). Reaction towards Cao Pi's joy at becoming crown prince In 217, after Cao Cao's son Cao Pi won the succession struggle against his younger brother Cao Zhi and became the heir apparent to their father's vassal kingdom, he was so elated that he hugged Xin Pi and said: "Sir, don't you know how happy I am?" When Xin Pi told his daughter about it, she sighed and said: "A crown prince will succeed a ruler and inherit his kingdom one day. How can he succeed his father without feeling sad? How can he rule a kingdom without feeling intimidated? If he expresses joy instead of sadness and fear,