Christianity in Joseon

1866 military campaign

Seohak was the introduction of technology, philosophy and most prominently, Catholicism and Western ideas to Joseon Korea in the 18th century. It is also occasionally referred to as Cheonjuhak () which means 'Heavenly Learning'. Literally meaning "Western learning", Seohak's antonym was Donghak (; ), which featured neo-Confucianism and other traditional ways of thought.

Korean Catholic persecution in 1866

mass persecution of Korean Catholics ordered by Queen Jeongsun during King Sunjo of Joseon's reign