Here is the exhaustive biography, ancestral background, historical records, and Romance of the Three Kingdoms narrative for Xu Si (許汜), an officer from Yan Province who defected alongside Zhang Miao to Lu Bu, participated in the defense of Xiapi, and later sought refuge under Liu Biao during the late Eastern Han Dynasty.
Contents
Defection to Lu Bu & Siege of Xiapi
Xu Si originally served as an officer under Zhang Miao, the Prefect of Chenliu in Yan Province. When Zhang Miao and Chen Gong chose to betray Cao Cao and welcome Lu Bu into the province, Xu Si joined Lu Bu’s faction. Following subsequent military setbacks against Cao Cao, Xu Si remained loyal to Lu Bu during his retreat and escape to Xiapi. During the intense siege of Xiapi by Cao Cao and Liu Bei in Chapter 19 of the novel, Xu Si and Wang Kai were dispatched as envoys to break through enemy lines and seek military reinforcements and alliance restoration from Yuan Shu.
Negotiations with Yuan Shu & Later Years Under Liu Biao
When Xu Si and Wang Kai reached Yuan Shu, the warlord demanded that Lu Bu send his daughter as a bride to his court before he would dispatch troops. Although the envoys returned with this condition, Lu Bu’s planned breakout attempt failed due to compromised intelligence. Following Lu Bu’s defeat and execution at Xiapi, Xu Si fled Jing Province and entered the service of Liu Biao. During his time under Liu Biao, Xu Si engaged in a famous philosophical debate with Liu Bei regarding the character of Chen Deng, during which Liu Bei heavily criticized Xu Si for being a self-absorbed, idle philosopher who failed to aid the chaotic state of the land.
Xu Si (許汜) — Historical & Literary Timeline
Defection to Lu Bu & Campaign in Yan Province
Joins Zhang Miao in betraying Cao Cao to support Lu Bu. Participates in the defense of Puyang and subsequent military campaigns across Yan Province and Xuzhou.
Embassy to Yuan Shu During the Siege of Xiapi
Dispatched alongside Wang Kai in Chapter 19 to break through Cao Cao’s siege lines and negotiate military aid from Yuan Shu, returning with Yuan Shu’s marriage demands.
Fleeing to Jing Province & Debate with Liu Bei
Flees to Jing Province after Lu Bu’s downfall and serves Liu Biao. Engages in a famous dialogue criticizing Chen Deng, which is sharply rebuked by Liu Bei.
Romance of the Three Kingdoms Narrative
In Luo Guanzhong’s historical novel Romance of the Three Kingdoms, Xu Si appears prominently in Chapter 19 as a loyal strategist for Lu Bu during the desperate defense of Xiapi. He proposes seeking assistance from Yuan Shu and successfully navigates past Cao Cao’s blockades alongside Wang Kai. However, Yuan Shu’s exorbitant demands and the failure of their subsequent breakout attempt mark the collapse of Lu Bu’s regime, after which Xu Si transitions into service under Liu Biao.
Key Relationships
Family
- No information
Friends
- Zhang Miao (张邈, Trương Mạc): The Prefect of Chenliu who led the rebellion against Cao Cao in 194 AD, bringing Xu Si into the service of Lu Bu.
- Wang Kai (王楷, Vương Giai): A fellow officer who served alongside Xu Si; they were dispatched together as envoys to Yuan Shu during the 198 AD Siege of Xiapi.
- Lu Bu (吕布, Lữ Bố): The warlord and supreme commander whom Xu Si served faithfully throughout the campaigns in Yan Province and the defense of Xiapi.
Enemies
- Cao Cao (曹操, Tào Tháo): The primary antagonist of Xu Si’s faction who besieged Xiapi in 198 AD and eventually dismantled the regime Xu Si served.
- Liu Bei (刘备, Lưu Bị): An opponent during the Siege of Xiapi who later, while both were under the protection of Liu Biao, publicly rebuked Xu Si for his character and lack of concern for the state.
- Chen Deng (陈登, Trần Đăng): A Xuzhou official whom Xu Si criticized for arrogance during a debate in Jing Province, leading to a sharp defense of Chen Deng by Liu Bei.
- Yuan Shu (袁术, Viên Thuật): A warlord who demanded the marriage of Lu Bu’s daughter as a condition for military aid, ultimately failing to provide the support Xu Si and Wang Kai sought in 198 AD.
Other
- Liu Biao (刘表, Lưu Biểu): The Governor of Jing Province who provided refuge and employment to Xu Si following the defeat and execution of Lu Bu in 198 AD.
In Novel
Chapter 11
- Xu Si (许汜, Hứa Tỉ): Scholar and official who defected alongside Chen Gong (陈宫, Trần Cung) and Zhang Miao (张邈, Trương Mạc) from Cao Cao (曹操, Tào Tháo) to support Lü Bu’s (吕布, Lã Bố) conquest of Yanzhou.
Chapter 19
- Xu Si (许汜, Hứa Tỉ): Advisor to Lü Bu (吕布, Lã Bố) during the desperate siege of Xiapi; he and Wang Kai (王楷, Vương Giai) slipped through the blockade to appeal to Yuan Shu (袁术, Viên Thuật) for reinforcements by offering Lü Bu’s daughter in marriage, though their escort mission was thwarted by Guan Yu (关羽, Quan Vũ).
In History
Summary
- Xu Si (许汜, Hứa Tỉ) was a minor official associated with the late Eastern Han political elite and is chiefly remembered through an anecdote involving Chen Deng (陈登, Trần Đăng).
Historical Record
- Xu Si (许汜, Hứa Tỉ) was a real historical figure. His surviving historical record is brief and is preserved through the biography and commentary concerning Chen Deng.
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