A fifteen-year-old Korean Catholic girl who died in a Seoul prison during the Gihae persecution, one of the youngest of the 103 Martyrs of Korea.

Saint Agatha Yi was a Korean Catholic girl who died in a Seoul prison on 9 January 1840 at only fifteen years old, one of the youngest of the 103 Korean martyrs later canonized by the Catholic Church. Born in 1824 into the persecuted Catholic community of the Joseon capital, she would have known from early childhood that her family’s faith was illegal and dangerous, since Korea’s Catholic community had already endured earlier waves of persecution before her birth. Arrested during the Gihae persecution that began in 1839, she died in custody, whether from the effects of interrogation, imprisonment, or formal execution the surviving record does not specify with certainty, still a young teenager who had refused, as her elders had, to renounce her baptism. Her death is remembered among the group of 103 Korean martyrs canonized by Pope John Paul II in Seoul in 1984.

Quick Facts

• Born: 1824, Seoul, Korea
• Died: 9 January 1840, Seoul Prison, Korea, aged 15, during the Gihae persecution
• Feast Day: September 20, collective feast of the Korean Martyrs
• Beatified: 5 July 1925, by Pope Pius XI
• Canonized: 6 May 1984, Seoul, Korea, by Pope John Paul II
• Patron of: Honored among the 103 Martyrs of Korea; no distinct individual patronage

Who Was Saint Agatha Yi?

Agatha Yi was a Korean Catholic girl who died in a Seoul prison on 9 January 1840 at only fifteen years old, one of the youngest of the 103 Korean martyrs later canonized by the Catholic Church. Born in 1824 into the persecuted Catholic community of the Joseon capital, she would have known from early childhood that her family’s faith was illegal and dangerous, since Korea’s Catholic community had already endured earlier waves of persecution before her birth. Arrested during the Gihae persecution that began in 1839, she died in custody, whether from the effects of interrogation, imprisonment, or formal execution the surviving record does not specify with certainty, still a young teenager who had refused, as her elders had, to renounce her baptism. Given her youth and the limited documentation typical of many lay martyrs of this persecution, few further biographical details are reliably known, and none should be invented. Her death is remembered among the group of 103 Korean martyrs canonized by Pope John Paul II in Seoul in 1984.

Historical Setting

Agatha Yi died during the Gihae persecution of 1839-1840, a period in which Korean Catholic families, including children, faced arrest simply for association with the faith, since Joseon authorities frequently detained entire households once one member was identified as Catholic. Conditions in Korean prisons of this era were harsh, and many of those arrested during the persecutions died in custody from illness, injury, or the effects of torture before ever reaching formal execution, a pattern that appears to be reflected in the sparse surviving record of Agatha’s own death.

Why the Church Venerates Saint Agatha Yi

The Church venerates Agatha Yi as one of the youngest witnesses among the Korean martyrs, a young teenager who bore the same test of fidelity asked of the adults around her and did not waver. Her death, like that of other very young martyrs honored by the Church across history, is treated with particular tenderness and admiration precisely because so little time had been given her to weigh the cost, and yet her commitment held.

Canonization and Feast Day

Agatha Yi’s cause proceeded together with those of her fellow Korean martyrs. Pope Pius XI beatified the group on 5 July 1925, and Pope John Paul II canonized 103 of them, Agatha Yi among them, on 6 May 1984 in Seoul. The Korean Martyrs are commemorated together on 20 September, and the sparseness of the individual record for the youngest martyrs like Agatha should be honestly acknowledged rather than filled in with invented detail.

What Catholics Can Learn Today

Agatha Yi’s death at fifteen invites Catholics today, especially parents and those who form children in the faith, to consider how early and how deeply real conviction can take root when it is nurtured honestly rather than merely assumed. Her brief life, ended before it could fully unfold, stands as a quiet but forceful reminder that no one is too young to belong entirely to Christ, and that the faith handed on in childhood can prove, when tested, to be genuinely one’s own.

A Prayer to Saint Agatha Yi

Saint Agatha Yi, youngest of the martyrs of Korea, you were still a child in years when you were asked to give everything, and you gave it without turning back. Pray for the children and young people of the Church, that the faith given to them in their earliest years may grow strong enough to withstand whatever tests life brings. Comfort parents who wonder whether they are forming their children well in belief, and give them your example as a sign of hope. Keep watch over every child who suffers for the faith today. Amen.

Sources

• Vatican.va (canonization records of the Korean Martyrs, 1984)
• the Roman Martyrology
• the Catholic Encyclopedia (New Advent)
• the Archdiocese of Seoul (historical archives)