| Cheng Yi | 
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| Imaginary of Cheng Yi by Shangguan Zhou (上官周, b. 1665). | 
| Born | 1033 | 
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| Died | 1107 (aged 74) | 
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| Occupation(s) | Classicist, essayist, philosopher, politician | 
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| Era | Neo-Confucianism | 
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| Region | Chinese Philosophy | 
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Cheng Yi (1033–1107), also known by various other names and romanizations, was a Chinese classicist, essayist, philosopher, and politician of the Song Dynasty. He worked with his older brother Cheng Hao. Like his brother, he was a student of Zhou Dunyi, a friend of Shao Yong, and a nephew of Zhang Zai. The five of them, along with Sima Guang, are called the Six Great Masters by his follower Zhu Xi. He became a prominent figure in neo-Confucianism, and the philosophy of Cheng Yi, Cheng Hao and Zhu Xi is referred to as the Cheng–Zhu school or the Rationalistic School.