Catherine Yi was a Korean Catholic laywoman and martyr born in Seoul around 1783. Raised in a religious household, she successfully converted her husband and raised her children in the Christian faith. Following religious persecution, she moved to Seoul with her daughter, Madeleine, to seek refuge. However, she was eventually arrested during the persecutions of 1839. After refusing to renounce her beliefs despite severe torture, she died in prison or was executed during the autumn of that year.