The Cause of Frank Duff, Founder of the Legion of Mary

Frank Duff

The International Headquarters of the Legion of Mary in Dublin was very pleased to receive a visit from the Secretary of the General Postulation of the Order of the Preachers, Fr. Llewellyn Muscat OP. In the days he spent in Dublin (3-7 November 2017) excellent direction was given to those working on the Cause of Frank Duff (1889-1980), founder of the Legion of Mary. Particular attention was given to the work of the Historical Commission in order to bring its work to a conclusion.

During his stay in Dublin Fr. Muscat met various people involved with different aspects of the Cause and was received by His Grace, Diarmuid Martin, Archbishop of Dublin. He visited the house in which Frank Duff lived for a considerable portion of his life and where he died. He visited the grave of Frank Duff in Glasnevin Cemetery, Dublin where he is buried.   He also visited the annual Legion Evangelisation Conference (Peregrinatio Pro Christo), where he encouraged the 200 attending to promote and pray for the Cause.

The Legion of Mary

The Legion of Mary was established in 1921 by Frank Duff. He was a member of the Society of St. Vincent de Paul and was at that time confined to a membership of men only. Some apostolic minded women asked what they might do, having attended a talk given by Frank Duff on St. Louis Marie de Montfort’s True Devotion to Mary.   From this the Legion of Mary was born on 7 September that year. Where the Vincent de Paul dealt with the great physical needs of the day the Legion complements its work by concentrating on the spiritual needs of which there were many.  

The Doctrine of the Mystical Body of Christ became part of the Legion’s action and Frank Duff saw that all the parts made up the whole by seeing and service Christ in everyone met.    The organisation also enabled the ordinary Catholic to fulfil the obligations of Baptism.    After the Eucharistic Congress of 1932 the Legion rapidly grew throughout the world.   It exists in over 170 countries and in the vast majority of dioceses thanks to the support of the Bishops and clergy who provide the much needed encouragement and spiritual formation they provide.

The active member attends a weekly meeting lasting no longer than 1 hour and 30 minutes and is assigned from the meeting to carry out (always in pairs) an apostolic duty for a minimum of 2 hours per week.     The auxiliary member complements the active member by saying the prayers of the Tessera (prayer card) – The Rosary, Catena (Magnificat) and final prayer for Faith.    These prayers are offered to Our Blessed Lady for her to use in whatever way she wishes.

The Legion of Mary is at the disposal of the Parish Priest to undertake whatever tasks he assigns to the Legion. The Legion of Mary only enters into a Diocese with the permission of the Bishop and only into the Parish with the permission of the Parish Priest.

Prayers for the Beatification of Servant of God Frank Duff

God our Father, You inspired your servant Frank Duff with a profound insight into the mystery of Your Church, the Body of Christ, and of the place of Mary the Mother of Jesus in this mystery. In his immense desire to share this insight with others and in filial dependence on Mary he formed her Legion to be a sign of her maternal love for the world and a means of enlisting all her children in the Church's evangelising work.

We thank you Father for the graces conferred on him and for the benefits accruing to the Church from his courageous and shining faith. With confidence we beg You that through his intercession you grant the petition we lay before You . ............... We ask too that if it be in accordance with Your will, the holiness of his life may be acknowledged by the Church for the glory of your Name, through Christ Our Lord, Amen.


All those who receive graces with the intercession of the Servant of God are invited to contact the office of the General Postulation of the Order ( or the office of the Legion of Mary in Dublin (International Centre: Concilium Legionis Mariae, De Montfort House, Morning Star Avenue, Brunswick Street, Dublin 7, Ireland).

Sile NiChochlain


(11 November 2017)