Yi ChingokYi Chingok was a general of the Korean Joseon dynasty, known for his rebellion in 1453.BiographyHe served as the Provincial Army Commander or byeongma dojeoljesa of Hamgil Province from 1450 until 1453. As a former subordinate of Kim Chongsŏ who was killed by his political rival Grand Prince Suyang, Yi was recalled by Grand Prince Suyang-controlled royal court who tried to replace him with Pak Ho-mun in 1453. However, Yi killed his new replacement and rose up in rebellion. He attempted to gather Jurchen support for his rebellion by declaring himself the emperor of the Geum dynasty, a revival of the Jurchen Jin. He wanted to establish the new dynasty's capital at Wuguocheng, but was killed in by his subordinates, Chŏng Chong and Yi Haeng-gŏm before he could cross the Tumen River.