Cheng Yi (simplified Chinese: 程颐; traditional Chinese: 程頤; pinyin: Chéng Yí; Wade–Giles: Ch’eng I 1033–1107) courtesy name Zhengshu (正叔) also known as Mr. Yichuan (伊川先生) was a Chinese philosopher born in Luoyang during the Song Dynasty. He worked with his older brother Cheng Hao (程顥). Like his brother he was a student of Zhou Dunyi a friend of Shao Yong and a nephew of Zhang Zai.
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