Yi Hwang (January 3, 1502– January 3, 1571) was the most important Korean philosopher, writer, and Confucian scholar of the Joseon Dynasty. He was a figure of the Neo-Confucian literati, established the Yeongnam School and set up the Dosan Seowon, a private Confucian academy. Yi Hwang is often referred to by his pen name Toegye ("Retreating Creek"). His courtesy name was Gyeongho. He is considered the most important philosopher of Korea - he is honored by printing his portrait on the (most often used) 1000 Won banknote, on the reverse of which one can see an image of his school, Dosan Seaowon. His interpretation of Neo-Confucianism was influential not only in Korea, but also in Japan, Taiwan, and Vietnam, and is now being studied even in the mainland China. His main work, Ten Diagrams on Sage Learning, originally published in classical Chinese language, has been already translated into modern Korean, Japanese, Vietnamese, English, French, German, Russian and Polish. Some of his writings were looted by the Japanese military during the Japanese invasion of Korea.

Yi Hwang - Wikipedia