Yu Yi (293 – April 342), courtesy name Shuyu, was a Chinese consort kin, official and military general of the Jin dynasty (266–420). He was a member of the prestigious Yu clan of Yingchuan as the younger brother of the powerful Jin minister, Yu Liang. However, after Yu Liang died in 340, it was his youngest brother Yu Zhigong who inherited Liang's military positions, and became a prominent political force during their time with their other brother Yu Bing, who handled court affairs.
Life Before Su Jun's rebellion Yu Yi was born in 293, during the reign of Emperor Hui of Jin, with his empress Jia Nanfeng as regent. When they were young, Yu Yi won praise from his elder brother Liang for being unrestrained and simple.(怿字叔预，少以通简为兄亮所称。) Jin Shu, vol.73 Yu Yi's father Yu Chen (庾琛) was the governor of Kuaiji Commandery along the southern shore of Hangzhou Bay and later served on the staff of Sima Rui the Prince of Langye (later Emperor Yuan) when Sima Rui was posted at Jianye.Jin Shu, vol.93 In the late 300s to early 310s, before he was 20, he was invited to serve under Sima Yang, the Prince of Xiyang; Yu Yi refused the invitation.(弱冠，西阳王羕辟，不就。) Jin Shu, vol.73. This invitation likely occurred before the Disaster of Yongjia, after which Sima Yang fled south. He later served under Sima Chong, the Prince of Donghai, in several roles, before serving as Left General of the Guards.(东海王冲为长水校尉，清选纲纪，以怿为功曹，除暨阳令，又为冲中军司马，转散骑侍郎，迁左卫将军。) Jin Shu, vol.73
Su Jun's rebellion and after In October 325, Yu Yi's brother-in-law Emperor Ming died. As his successor Emperor Cheng was still a child, Yu Yi's elder brother Yu Liang became regent, with their sister Yu Wenjun as empress dowager. Due to Yu Liang's mishandling, Su Jun rebelled together with Zu Yue in December 327.Vol 93 of Zizhi Tongjian and the annals of Emperor Cheng in Jin Shu both recorded that Su Jun and Zu Yue rebelled in the 11th month of the 2nd year of the Xianhe era; the month corresponds to 30 Nov to 30 Dec 327 in the Julian calendar. When rebel forces were about to capture Jiankang in 328, Yu Yi fled south together with his other brothers Liang, Tiao and Zhigong to join Wen Jiao.(亮携其三弟怿、条、翼南奔温峤，...) Jin Shu, vol.73 After the rebellion was put down in 329, Yu Yi was made Baron of Guangrao; he then took on the post of Administrator of Linchuan.(以讨苏峻功，封广饶男, 出补临川太守...) Jin Shu, vol.73
In April 339, as part of Yu Liang's plans for a northern expedition against Later Zhao, he submitted a memorial to the throne, requesting for Yu Yi to be made chief controller of all military affairs for Liangzhou and Yongzhou, Inspector of Liangzhou and garrisoned at Weixing; the memorial was approved. Later, as Weixing was deemed too remote and dangerous, Yu Yi's garrison point was shifted to Banzhou.(征西将军庾亮欲开复中原，...又表其弟临川太守怿为监梁‧雍二州诸军事、梁州刺史，镇魏兴...后以魏兴险远，命庾怿徙屯半洲...) Zizhi Tongjian, vol.96 Later that year, in November, as a response to Yu Liang's plans, Later Zhao emperor Shi Hu attacked several major cities and bases on the Jin-Zhao border, inflicting heavy losses and capturing Zhucheng (邾城, in modern Huanggang, Hubei) before withdrawing. With this major setback, Yu Liang had to cancel his plans; Yu Yi's appointment was then changed to Inspector of Yu Province. He was also placed in charge of all military affairs concerning Xuancheng, Lujiang, Liyang and Anfeng, and his garrison point was at Wuhu.(以辅国将军庾怿为豫州刺史，监宣城‧庐江‧历阳‧安丰四郡诸军事、假节，镇芜湖。) Zizhi Tongjian, vol.96
As Inspector of Yu Province, Yu Yi sent Inspector of Jiangzhou Wang Yunzhi (王允之) some poisoned wine in March 342. The suspicious Wang then fed the wine to a dog, which died after drinking; Wang then reported this secretly to Emperor Cheng. In response, Emperor Cheng exclaimed, "My elder maternal uncle had already caused chaos to the Tianxia. Now, my younger maternal uncle wishes to do the same!" When news of Emperor Cheng's response reached Yu Yi the following month, he committed suicide by poisoning himself.Zizhi Tongjian, vol.97
Yu Tiao Yu Tiao (庾条; 305 - 349)The annals of Emperor Mu in Jin Shu dated Huang Tao's (黄韬) rebellion to the 12th month of the 4th year of the Yonghe era, which corresponds to 6 Jan to 3 Feb 349 in the Julian calendar. was regarded as the least accomplished among the Yu brothers.(条于兄弟最凡劣，故禄位不至。) Jin Shu, vol.73 He was known to have fled Jiankang with most of his brothers during Su Jun's rebellion. As Administrator of Linchuan, Yu Tiao was known to have put down a rebellion in his jurisdiction during the reign of his grandnephew Emperor Mu of Jin.
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References
Fang, Xuanling (ed.) (648). Book of Jin (Jin Shu). Sima, Guang (1084). Zizhi Tongjian.