Choe Je-u, who used the pen name Su-un, (18 December 1824 – 15 April 1864) was the founder of Donghak, a Korean religious movement against foreign invasions and critical of Joseon Dynasty government policies of the time. His teachings led to peasant revolts in Korea which were contemporary with the Taiping Rebellion in China, and he was martyred by order of the Daewongun, only weeks before the death of Hong Xiuquan.