High Quality Content by WIKIPEDIA articles! Yeonsan-gun (1476 – 1506, r. 1494-1506), born Yi Yung, was the 10th king of Korea`s Joseon Dynasty. He was the eldest son of Seongjong by his second wife, Lady Yoon. He is often considered the worst tyrant in Joseon Dynasty, notorious for launching two bloody purges of the seonbi elite. He also seized a thousand women from the provinces to serve as palace entertainers, and appropriated the Seonggyungwan hall of study as a personal pleasure ground. Because he was overthrown, Yeonsan-gun did not receive a temple name.