The Legion of Mary

The Legion of Mary (Latin: Legio Mariae) is the largest apostolic organization of laypeople in the Catholic Church, with over 100 million active and auxiliary members worldwide as of 2026. Founded in Dublin, Ireland, on September 7, 1921, by Frank Duff, it aims to help members grow in holiness while serving God under the banner of Mary through spiritual works of mercy.

Core Mission and Spirituality

Purpose: The dual object is the spiritual development of its members and the advancing of the reign of Christ through Mary.

Spirituality: It is deeply rooted in Marian devotion, particularly the teachings of St. Louis-Marie de Montfort on "True Devotion to Mary".

Key Figures: The Legion is currently praying for the beatification of its founder, Frank Duff, as well as notable envoys Venerable Edel Quinn and Servant of God Alphonsus Lambe.

Membership and Structure

The organization is modeled after the Roman Army and uses Latin terminology for its hierarchy. 

Levels of Government:

Concilium Legionis Mariae: The supreme governing body based in Dublin.

Senatus: Governs a country or large region.

Regia, Comitium, and Curia: Intermediate levels managing various local groups.

Praesidium: The basic unit, typically based in a single parish.

Types of Members:

Active Members: Must attend a weekly meeting and perform at least two hours of assigned apostolic work weekly.

Auxiliary Members: Support the Legion through a daily service of prayer, including the Rosary and the Legion's "Tessera" prayers.

Higher Grades: Include Praetorians (active members with additional prayer obligations) and Adjutorians (auxiliary members with additional daily Mass and Office requirements).