Saint Alexius U Se-Yong

Martyrs of KoreaAlso known as

  • Alejo U Se-yong
  • Alessio U Se-yong
  • Alleksio
  • U Se-Yeong



Young layman, born to the wealthy nobility in the apostolic vicariate of Korea. Having become interested in Christianity, he met with Saint Siméon-François Berneux, and Saint Marcus Chong Ui-Bae served as his catechist. Convert. His family was strongly opposed to Christianity, and Alexius left home to work with missionaries, translating the Catechism and other texts to Korean.

During one of the repeated persecutions, all Christians in his village were arrested. Alexius gave in to his fears and denied the faith, and was released. He then repented and went to prison to confess his failure to his bishop. He was then arrested, imprisoned with the others, tortured, and finally executed for his faith. Martyr.






Additional Information

MLA Citation

  • “Saint Alexius U Se-Yong“. CatholicSaints.Info. 11 March 2017. Web. 18 June 2021. <>