CHRONICLES OF CHINESE HISTORY华 夏 历 史 志

?–653 CE

Imperial son-in-law (Fuma)aristocratPrefect of Fangzhou

Fang Yiai

房遗爱

Fang Yiai (died 653) was a native of Linzi, Qizhou (modern Zibo, Shandong Province). He was an aristocratic scion and imperial son-in-law of the early Tang Dynasty, the second son of the illustrious founding Chancellor Fang Xuanling (Duke of Liang). Historical annals record him as unlettered yet endowed with martial vigor. In 648, Emperor Taizong married Princess Gaoyang to Fang Yiai, appointing him Imperial Son-in-Law…

?–653 CETang Dynasty

PROFILE

Fang Yiai (died 653) was a native of Linzi, Qizhou (modern Zibo, Shandong Province). He was an aristocratic scion and imperial son-in-law of the early Tang Dynasty, the second son of the illustrious founding Chancellor Fang Xuanling (Duke of Liang). Historical annals record him as unlettered yet endowed with martial vigor. In 648, Emperor Taizong married Princess Gaoyang to Fang Yiai, appointing him Imperial Son-in-Law Commandant and General of the Right Guards. Following Fang Xuanling's death, fierce fraternal acrimony erupted between Fang Yiai and his elder brother Fang Yizhi over inheritance and the Liang dukedom. In the early Yonghui era under Emperor Gaozong, Fang Yiai was demoted to Prefect of Fangzhou. In 653, Princess Gaoyang and Fang Yiai conspired with veteran generals Xue Wanche, Chai Lingwu, and Prince of Jing Li Yuanjing to stage a palace coup. Uncovered and prosecuted by Chancellor Zhangsun Wuji, Fang Yiai was publicly executed in Chang'an, while Princess Gaoyang and numerous imperial princes were condemned to suicide.

Courtesy Name
Unrecorded
Historical Period
Early Tang Dynasty (Emperors Taizong and Gaozong reigns)
Dynasty / Regime
Tang Dynasty
Identity
Imperial son-in-law (Fuma), aristocrat, Prefect of Fangzhou
Date of Birth
Not recorded in historical sources
Date of Death
March 6, 653 CE（4th year of Gao Zong Yong Hui, 2nd month, 2nd day）
Ethnicity
Han Chinese
Native Place
Linzi, Qizhou (modern Linzi District, Zibo, Shandong Province)
Place of Death
Execution grounds, Chang'an
Age at Death
Unknown
Major Offices
Imperial Son-in-Law (Fuma Duwei), General of the Right Guards, Chamberlain for the Palace Revenues, Prefect of Fangzhou
Noble Title
Upper Pillar of State (Honorary); father Duke of Liang inherited by elder brother
Major Achievements
Married Princess Gaoyang (daughter of Emperor Taizong), commanded imperial guard formations, implicated in the 653 Yonghui treason conspiracy that altered Tang succession politics

LIFE TIMELINE

Chang'an ｜ Married Princess Gaoyang, seventeenth daughter of Emperor Taizong; appointed Imperial Son-in-Law.
Chang'an ｜ Father Fang Xuanling passed away; elder brother Fang Yizhi inherited the title Duke of Liang.
Chang'an ｜ Promoted to Chamberlain for Palace Revenues and Cavalier Attendant-in-Ordinary.
Fangzhou ｜ Exiled from the capital to serve as Prefect of Fangzhou following disputes with his brother.
Following Emperor Gaozong's ascension in 649 ｜ Following Emperor Gaozong's ascension in 649, mutual accusations between the brothers escalated.
Chang'an ｜ Conspired with Princess Gaoyang, Xue Wanche, and Prince Li Yuanjing to overthrow Emperor Gaozong.
Chang'an ｜ Interrogated by Zhangsun Wuji, convicted of high treason, and executed; family lines exiled.
Linzi ｜ Born as the second son of prominent statesman Fang Xuanling and Lady Lu.

BIOGRAPHY

Biography

Dynastic Lineage and Imperial Marriage

Fang Yiai belonged to the eminent Fang clan of Linzi in Shandong. His father, Fang Xuanling, served as the foremost administrative architect of Emperor Taizong's reign, directing the state bureaucracy for over two decades. As the second son, Fang Yiai grew up in the highest aristocratic circles of Chang'an. Traditional chronicles characterize him as athletic, brash, and disinclined toward classical studies, in stark contrast to his scholarly father. In 648, Emperor Taizong bestowed his favorite seventeenth daughter, Princess Gaoyang, upon Fang Yiai in marriage. The union elevated Fang Yiai to Imperial Son-in-Law (Fuma Duwei) and General of the Right Guards, solidifying the familial bond between the imperial house and the House of Fang. ### Fraternal Disputes over Succession Following the death of Chancellor Fang Xuanling in the autumn of 648, legal inheritance of the Duke of Liang passed automatically to the eldest son, Fang Yizhi. Princess Gaoyang, arrogant and assertive, resented Yizhi's primacy and pressured Emperor Taizong to transfer the dukedom and estate to Fang Yiai. Emperor Taizong sternly rebuked the request, creating deep friction between the princess and the throne. Following Emperor Gaozong's ascension in 649, mutual accusations between the brothers escalated. High officials investigated the feud, resulting in Fang Yiai's removal from the capital to serve as Prefect of remote Fangzhou in modern Hubei. ### The Treason Trial of Yonghui 4 Harboring bitter grievances over their exile, Fang Yiai and Princess Gaoyang engaged in clandestine discussions with disgruntled imperial kin and commanders, notably General Xue Wanche and Chai Lingwu (son-in-law of Princess Pingyang). The conspirators contemplated deposing the perceived weak Emperor Gaozong in favor of Emperor Taizong's younger brother, Li Yuanjing (Prince of Jing). In the first month of 653, the conspiracy was exposed. Emperor Gaozong appointed senior regent Zhangsun Wuji to conduct a comprehensive treason inquest. Under interrogation, Fang Yiai sought clemency by falsely implicating Prince Li Ke of Wu, whom Zhangsun Wuji had long viewed as a dangerous dynastic rival. On March 6, 653, Fang Yiai was executed by decapitation, Princess Gaoyang was ordered to commit suicide, and extensive purges devastated both the Tang imperial clan and the Fang lineage.

Major Activities

Consort Alliance with Princess Gaoyang

United the prominent bureaucratic power of the Fang family with the Tang royal house through marriage to Princess Gaoyang in 648. ### The 653 Coup Conspiracy Participated in organizing the abortive aristocratic plot to overthrow Emperor Gaozong in favor of Li Yuanjing, which became the catalyst for Zhangsun Wuji's wide-ranging political purges.

Personal Relations

  • Father: Fang Xuanling (Chancellor, Duke of Liang)
  • Mother: Lady Lu
  • Spouse: Princess Gaoyang (daughter of Emperor Taizong)
  • Brothers: Fang Yizhi (Duke of Liang), Fang Yize, Fang Yiyi
  • Co-conspirators: Li Yuanjing (Prince of Jing), Xue Wanche, Chai Lingwu
  • Inquisitor: Zhangsun Wuji (Chancellor and Regent)

Historical Assessment

The Old Book of Tang (Jiu Tangshu) notes that Fang Yiai possessed neither administrative capability nor personal prudence, allowing pride, marital ambition, and factional resentment to bring sudden ruin upon one of the Tang dynasty's most illustrious founding households.

LOCAL NETWORK

FIGURES ASSOCIATED WITH THIS DYNASTY

598 CE–649 CE

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566 CE–635 CE

Li Yuan

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685 CE–762 CE

Li Longji

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An Lushan

An Lushan (January 22, 703–January 29, 757), originally named Yaluoshan (also written Aluoshan), was said in the source to have originally borne the surname Kang, possibly reflecting origins connected with Kangju/Samarkand. After his mother married the Turkic man An Yanyan, he took the surname An and the name Lushan. He was from Liucheng in Yingzhou (south of present-day Chaoyang, Liaoning) and became the initiator o

Bibliography

  • Liu Xu et al., Old Book of Tang (Jiu Tangshu), Chapter 66, Biography of Fang Xuanling.
  • Ouyang Xiu and Song Qi, New Book of Tang (Xin Tangshu), Chapter 96, Biography of Fang Xuanling.
  • Sima Guang, Zizhi Tongjian, Volume 199, Tang Chronicles.