Du Yu (222 – January or February 285), courtesy name Yuankai,(杜预，字元凯，京兆杜陵人也。) Jin Shu, vol.34 was a Chinese classicist, military general, and politician of the state of Cao Wei during the late Three Kingdoms period and early Jin dynasty.
Life Du Yu was from Duling County (), Jingzhao Commandery (), which is located northwest of present-day Xi'an, Shaanxi. He married Princess Gaolu, a sister of Sima Zhao,(预尚帝妹高陆公主) Jin Shu, vol.34 the regent of the Cao Wei state from 255 to 265 and the father of Sima Yan (Emperor Wu), later the first emperor of the Jin dynasty (266–420).
A prolific author, Du Yu was a self-proclaimed addict of the Zuo Zhuan and wrote an influential commentary to it. He was one of the most important commanders under the Wei general Zhong Hui during the conquest of Wei's rival state, Shu. After the Shu campaign, he was also involved in putting down Tufa Shujineng's rebellion. Just before Yang Hu's death in December 278, he recommended that Du Yu replace him as commander for the conquest of the state of Eastern Wu.(羊祜疾笃，举杜预自代。) Zizhi Tongjian, vol.80. Prior to his death, Yang was deeply involved in drafting up plans for the invasion. About a year after Yang's death, the Jin dynasty's invasion of Wu began. Leading an army, Du Yu managed to lay waste to the Wu army with great force within a few months, and received the surrender of Sun Hao, the last Wu emperor, in May 280. His military achievements were all the more remarkable due to his physical weaknesses; it was recorded that he was unable to ride a horse or shoot an arrow with significant force.(预身不跨马，射不穿札...) Jin Shu, vol.34. "She bu chuan zha" was also used to describe Chen Qingzhi in Book of Liang and History of the Southern Dynasties.
Du Yu was also an ancestor of the Tang dynasty poet Du Fu, and his grandfather Du Shenyan.(杜审言，字必简，襄州襄阳人，晋征南将军预远裔。....审言生子闲，闲生甫。) Xin Tang Shu, vol.201 Unlike his predecessors, Du Yu used the Zuo Zhuan to comment on the Chunqiu Classic. He therefore combined the two books in one, which has been the common practice since.
See also Lists of people of the Three Kingdoms
Notes
References
Chen, Shou (3rd century). Records of the Three Kingdoms (Sanguozhi). Fang, Xuanling (ed.) (648). Book of Jin (Jin Shu).
Pei, Songzhi (5th century). Annotated Records of the Three Kingdoms (Sanguozhi zhu).