Yi Ching-ok

Yi Ching-ok (, 1399 – October 20, 1453) was a general of the Korean Joseon dynasty, known for his rebellion in 1453.

Biography
He served as the Provincial Army Commander or byeongma dojeoljesa of Hamgil Province from 1450 until 1453. As a former subordinate of Kim Jong-seo who was killed by his political rival Grand Prince Suyang (the future King Sejo), 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 Jongseong by his subordinates, Chŏng Chong and Yi Haeng-gŏm  before he could cross the Tumen River.