A Spanish Dominican missionary priest martyred at Thăng Long in 1745 during an early wave of persecution against Vietnam’s Catholic missions.

Saint Mateo Alonso de Leciñana y Alonso was a Spanish Dominican priest who served as a missionary in Vietnam, martyred at Thăng Long, present-day Hanoi, on January 22, 1745, at the age of forty-two, during one of the earlier waves of persecution faced by Catholic missions in Vietnam. He was canonized in 1988 among the 117 Martyrs of Vietnam.

Quick Facts

• Born: Spain
• Died: January 22, 1745, Thăng Long, Hanoi, Vietnam (age 42)
• Venerated as: Dominican priest and missionary martyr
• Canonized: 1988 by Pope John Paul II; Feast Day: November 24

Who Was Saint Mateo Alonso de Leciñana y Alonso?

As a member of the Order of Preachers, Mateo Alonso de Leciñana came from Spain to serve as a missionary priest in Vietnam, part of a long Dominican presence in Southeast Asian missions dating back to the sixteenth century. He worked among Vietnamese Catholic communities in the northern kingdom of Tonkin until his arrest and execution at Thăng Long, the historic capital now known as Hanoi.

Historical Setting

Persecution of Christianity in eighteenth-century Vietnam predates the better-known nineteenth-century campaigns under later emperors, but it followed a similar pattern: local rulers, wary of foreign missionaries and suspicious of converts’ loyalty, periodically ordered crackdowns that swept up priests and religious along with lay believers. Leciñana’s death came during one such episode in the Trịnh-controlled north.

Why the Church Remembers Saint Mateo Alonso de Leciñana y Alonso

The Church remembers Leciñana as part of the long chain of missionary martyrs who sustained the Catholic presence in Vietnam across three centuries of intermittent persecution, well before the large-scale nineteenth-century martyrdoms for which the Vietnamese Church later became especially known. His death is a reminder that this persecution was not a single episode but a recurring feature of the mission’s long history.

Canonization and Feast Day

Mateo Alonso de Leciñana was beatified in 1906 and canonized in 1988 by Pope John Paul II, together with the wider group of 117 Martyrs of Vietnam, spanning missionaries and Vietnamese laypeople and clergy across several centuries. Their shared feast falls on November 24.

What Catholics Can Learn Today

His life reflects the patient, often anonymous perseverance of the missionary vocation: leaving one’s homeland permanently for a mission field where danger was a known and recurring risk. Catholics can draw from him encouragement for any sustained, long-term commitment to serving the Church far from comfort or recognition.

A Prayer to Saint Mateo Alonso de Leciñana y Alonso

Saint Mateo Alonso de Leciñana, you left your homeland to serve the Church in Vietnam and gave your life there. Pray for missionaries serving far from home today, that they may have your perseverance and your trust in God’s plan. Amen.

Sources

• Vatican.va, biography prepared for the canonization of the Martyrs of Vietnam (1988)
• Roman Martyrology (Martyrologium Romanum)
• New Advent Catholic Encyclopedia (newadvent.org)