Yeonsangun or Prince Yeonsan (Korean: 연산군; Hanja: 燕山君; 23 November 1476 – 20 November 1506), personal name Yi Yung (이융; 李㦕), was the 10th monarch of the Joseon dynasty of Korea. Often considered the worst tyrant in Joseon's history and perhaps all Korean history, he is notorious for launching two bloody purges, seizing hundreds of women from all over the peninsula to serve as palace entertainers, and appropriating Sungkyunkwan as a personal pleasure ground.