of the
Summer Palace, Beijing. Xu Shu is featured as a fairly prominent character in the historical novel
Romance of the Three Kingdoms, which romanticises the historical events before and during the
Three Kingdoms period. He appeared mainly in chapters 35–36, in which he served as
Liu Bei's strategist before
Zhuge Liang came along. In the novel, his original name was
Shan Fu (單福), perhaps due to a misreading of the phrase "本單家子" in the
Weilue. The phrase could be read as him being a son of the Shan family, but in this context, it actually meant that he was a son of a poor family. Xu Shu was singing on the streets of
Xinye when Liu Bei noticed him and asked him if he was either the "
Sleeping Dragon" or the "
Fledgling Phoenix" that
Sima Hui spoke of. However, Xu Shu told Liu Bei that he was neither of them. He agreed to become Liu Bei's strategist and helped Liu counter an invading army led by
Cao Cao's general
Cao Ren. Cao Ren deployed his troops in an "
Eight Gates Golden Locks Formation" (八門金鎖陣) outside Xinye, but Xu Shu pointed out the weaknesses in the formation and instructed Liu's general
Zhao Yun on how to break it. Zhao Yun led his men to attack the formation and succeeded in breaking it and defeating Cao Ren. Xu Shu also accurately predicted that Cao Ren would launch a surprise attack that night after his defeat. Liu Bei defeated Cao Ren again in the night battle and forced Cao Ren to retreat. Cao Cao was impressed when he heard about Xu Shu and was eager to recruit Xu as an adviser. He invited Xu Shu's mother to meet him and asked her to write a letter to her son, requesting that her son come to join him. Xu Shu's mother refused, denounced Cao Cao as a treacherous villain, and threw an ink stone at him. The furious Cao Cao ordered Xu Shu's mother to be executed but changed his mind when
Cheng Yu reminded him that Xu Shu would be more determined to help Liu Bei oppose him if he killed his mother. Cao Cao then had Xu Shu's mother detained and asked Cheng Yu to pretend to be Xu Shu's sworn brother to win the trust of Xu's mother. After some time, Cheng Yu got close to Xu Shu's mother and learnt to mimic her handwriting. He wrote a letter to Xu Shu in the handwriting of Xu's mother, telling Xu that she was in trouble and urging him to come to the imperial capital Xu (許; present-day
Xuchang,
Henan) quickly. Xu Shu was a filial son so he immediately left for Xu after reading the letter. Xu Shu was in a hurry when he sped off on horseback. On the way, he suddenly remembered something and immediately turned back to meet Liu Bei and recommend
Zhuge Liang to him. He then resumed his journey to Xu. When he arrived at his destination, he was shocked to discover that he had been tricked. His mother was furious with her son's failure to discern between truth and deception, and ashamed by the fact that her son joined Cao Cao instead of Liu Bei. She committed suicide. Xu Shu remained with Cao Cao, but he swore never to give advice to Cao. The Chinese saying "His body is in
(Cao) Cao's camp, but his heart is actually with the
Han (dynasty)" () is derived from this story about Xu Shu and
another story about
Guan Yu in
Romance of the Three Kingdoms. It is used to describe a situation where a person who ostensibly works for a "bad" organisation is actually loyal towards another "good" organisation. ==In popular culture==