First Korean baptized a Catholic, in Beijing in 1784; he founded the first Korean Catholic community and was executed in 1801
From a Southerner scholarly family, he went to Beijing in 1783 with his father's winter-solstice embassy and was baptised the next year with the name Peter. He was Jeong Yak-yong's brother-in-law. He kept up his activities after a gathering of believers was uncovered in 1785, and was executed in the Catholic Persecution of 1801.
Yun Ji-chung, a Catholic of yangban birth in Jinsan, was executed for burning his mother’s ancestral tablet and refusing the rites — the first major crackdown on Catholicism.
Queen Jeongsun banned Catholicism and had Yi Seung-hun and about a hundred believers executed; Jeong Yak-yong and his brother were exiled.
Catholic of Jinsan executed for burning his mother’s ancestral tablet and refusing Confucian rites (the Jinsan incident)
Twenty-second king of Joseon, founder of the Gyujanggak library and builder of Hwaseong Fortress
Twenty-third king of Joseon, whose reign under in-law clan rule saw the Hong Gyeong-nae rebellion
Silhak scholar who helped design Hwaseong; exiled to Gangjin, where he wrote the Mongmin simseo
Jeong Yak-yong's elder brother who, exiled to Heuksando in the Catholic Persecution of 1801, surveyed its sea life in the Jasan eobo