
Francis Michael Duff, Irish author, lay Catholic and founder of the Legion of Mary, known for bringing attention to the role of the Catholic laity during the Second Vatican Council of the Roman Catholic Church, is born at 97 Phibsboro Road, Dublin, on June 7, 1889.
Duff is the eldest of seven children of John Duff, a civil servant with the local government board, and his wife, Susan Letitia (née Freehill), a civil servant with the post office. The wealthy family lives in the city at St. Patrick’s Road, Drumcondra. He attends Blackrock College.
In 1908, Duff enters the Civil Service and is assigned to the Irish Land Commission. In 1913, he joins the Society of Saint Vincent de Paul and is exposed to the real poverty of Dublin. Many who live in tenement squalor are forced to attend soup kitchens for sustenance, and abject poverty, alcoholism, street gangs, and organized prostitution are rife in parts of Dublin. He joins and soon rises through the ranks to become President of the Saint Patrick’s Conference at Saint Nicholas of Myra Parish. Having concern for people he sees as materially and spiritually deprived, he has the idea to picket Protestant soup kitchens as he considers they are giving aid in the form of food and free accommodation at hostels, in return for not attending Catholic services. He sets up rival Catholic soup kitchens and, with his friend, Sergeant Major Joe Gabbett, who has already been working at discouraging Catholics from patronizing Protestant soup kitchens. They succeed in closing down two of them over the years.
In 1916, Duff publishes his first pamphlet, Can we be Saints?, where he expresses the conviction that all are called to be saints without exception, and that through Christian faith, all have the means necessary.
In 1918, a friend gifts Duff a copy of the book True Devotion to Mary by the seventeenth-century French cleric Louis de Montfort, which influences his views on Mary. He is additionally influenced by the writings of John Henry Newman.
Duff briefly acts as private secretary to Michael Collins, then-Chairman of the Provisional Government and commander-in-chief of the National Army. In 1924, he is transferred to the Department of Finance.
On September 7, 1921, along with Fr. Michael Toher and fifteen predominantly young women, he is present at the first meeting of the association which he would forge as the Legion of Mary. He models the Legion on the Roman legions, naming the local unit the “praesidium,” and he immerses himself in the apostolic work which dominates the rest of his life.
In 1922, Duff establishes the Sancta Maria hostel in Dublin as a refuge for prostitutes, and is the driving force behind the closure of “Monto,” Dublin’s notorious red-light district. In 1927, he establishes the Morning Star hostel for homeless men in Dublin, and in 1930 the Regina Coeli hostel for homeless women, which provides special units for unmarried mothers and their children at a time when neither church nor state favour helping unmarried women to keep their children.
While Duff enjoys the support of W. T. Cosgrave, Ireland’s head of government, and in May 1931 is granted an audience with Pope Pius XI, his efforts are opposed internally in the Dublin diocese. In the 1930s and 1940s, he creates the Mercier Society, a study group designed to bring together Catholics and Protestants, as well as the Pillar of Fire, a group designed to promote dialogue between Irish Catholics with Ireland’s Jewish community.
Duff retires from the Civil Service in 1934 to devote all of his time to the Legion of Mary. For the rest of his life, with the help of many others, he guides the Legion’s worldwide extension.
In 1965, Pope Paul VI invites Duff to attend the Second Vatican Council as a lay observer. When he is introduced to the assembly by Archbishop John Heenan of Liverpool, he receives a standing ovation.
Duff makes the promotion of devotion to the Sacred Heart of Jesus part of the Legion’s apostolate.
Duff dies in Dublin at the age of 91 on November 7, 1980. He Is interred in Glasnevin Cemetery. In July 1996, the cause of Duff’s beatification is introduced by Cardinal Desmond Connell.
Today, the Legion of Mary has an estimated four million active members and 10 million auxiliary members in close to 200 countries in almost every diocese in the Catholic Church.




