Blessed Eleuterio Castillo, C.M.: Fidelity to the Eucharist and Martyrdom at the Age of 33

October 3, 2026

At the dawn of the religious persecution of 1936, as he was approaching the age of Christ, the Vincentian priest Eleuterio Castillo risked his life to protect the Most Holy Eucharist at the convent of the Trinitarian Sisters in Madrid. His courageous priestly witness, marked by love for the Mission and fidelity to the Church, culminated in the offering of his life as a martyr alongside his brother-in-law in the early hours of September 3.

By Communication

A Young Vice-Director of Novices at the Service of the Mission

Born in the Burgos locality of Marmellar de Arriba, Fr. Eleuterio Castillo, C.M., was a priest of deep interior life and great apostolic zeal. Within the Congregation of the Mission, the Vincentian Missionaries, he served as Vice-Director of Novices (internal seminary), accompanying and forming future generations of Vincentian missionaries.

He also served as chaplain to the convent of the Trinitarian Sisters.

Eucharistic Zeal at the Trinitarian Convent

When the tragic events of the summer of 1936 unfolded, his first concern was not to save his own life, but to safeguard the Blessed Sacrament from any profanation.

With courage and determination, he managed to reach the Trinitarian convent in order to consume the Sacred Hosts. Immediately after this act of Eucharistic devotion, he was arrested together with the 16 members of the Vincentian community of Hortaleza.

A Second Arrest and a Family Calvary

Thanks to the intervention of a relative, Fr. Eleuterio was initially released from prison. However, he remained under close surveillance.

Some time later, he was arrested again, and his brother-in-law, Juan Alonso Hidalgo, a member of the Spanish Civil Guard, was also detained.

At the Headquarters where his sister lived, Fr. Eleuterio’s priestly identity was well known. Just a few months earlier, in May 1936, he had administered First Communion to two of his nieces and a large group of girls at the nearby church of Las Salesas, during a moving and well-attended celebration.

The seed of faith planted within the family would bear lasting fruit: one of those nieces would later enter the Monastery of Loeches in Madrid as a Discalced Carmelite.

Martyrdom Near the Headquarters

After they were denounced by one of the guards at the Headquarters, the earthly fate of Fr. Eleuterio and his brother-in-law was sealed.

In the early hours of September 3, 1936, both were taken to the vicinity of the Headquarters and executed.

Fr. Eleuterio Castillo was only a few days away from turning 33. He gave his life in forgiveness, sealing with his blood a priestly life devoted to God, to the formation of his confreres and to love for the Eucharist.

Prayer to Blessed Eleuterio Castillo and His Fellow Martyrs

Almighty and eternal God,
who granted the martyrs the grace to die for Christ,
help us in our weakness so that,
just as they did not hesitate to die for you,
we too may remain steadfast in professing your Holy Name.

Through our Lord Jesus Christ, your Son,
who lives and reigns with you in the unity of the Holy Spirit,
God forever and ever.

Amen.

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