Jo Gwang-jo
After the fall of Goryeo and the establishment of the Joseon Dynasty by Yi Song-gye in 1392, neo-Confucianism was installed as the state ideology. Buddhism, and organized religion in general, was considered poisonous to the neo-Confucian order. Buddhism was accordingly restricted and occasionally persecuted by Joseon. As neo-Confucianism encouraged education, a number of neo-Confucian schools (서원 "seowon" and 향교 "hyanggyo") were founded throughout the country, producing many scholars including Jo Gwang-jo (조광조, 趙光祖; 1482–1520), Yi Hwang (이황, 李滉; pen name Toegye 퇴계, 退溪; 1501–1570) and Yi I (이이, 李珥; 1536–1584).