Francesco Faà di Bruno

Francesco Faà di Bruno pursued his scientific studies in Paris, at the Sorbonne and the Collège de France, where he worked under the guidance of illustrious scholars such as Augustin-Louis Cauchy and Urbain Le Verrier. In 1855, he formulated his most famous mathematical result, known as the "Faà di Bruno's formula," which generalizes the n-th order derivative of a composite function. He obtained his doctorate in science in Paris in 1856. At the invitation of Cauchy, he also participated in the founding of the Œuvre des Écoles d'Orient (which became the Œuvre d'Orient) in April 1856. Upon his return to Italy, he taught mathematics and higher analysis at the University of Turin and the Military Academy. A universal mind, he also distinguished himself as an astronomer, physicist, and inventor, notably designing a differential barometer and an electric alarm clock. Alongside his research, Francesco was actively involved in the social sphere in Turin, joining the movement of the Piedmontese "social saints." In 1859, he founded the Opera di Santa Zita (Work of Saint Zita), intended to protect and promote the dignity of domestic workers, young girls from the countryside arriving in the city, single mothers, and elderly women. He built for them a true "city of women" including schools, professional workshops, a boarding school, and a retirement home. To ensure the sustainability and management of these charitable works, he founded on July 16, 1881, the Congregation of the Minims Sisters of Our Lady of Suffrage (Suore Minime di Nostra Signora del Suffragio). This religious family received the mission of combining social and educational action for women with an intense life of prayer, particularly oriented toward suffrage for the souls in Purgatory.

Although long called to the priesthood, Francesco Faà di Bruno encountered opposition from the Archbishop of Turin, Mgr Lorenzo Gastaldi, who refused his ordination due to his advanced age (he was then over 50) and his strong personality. It was thanks to the direct and benevolent intervention of Pope Pius IX that he was finally ordained a priest in Rome on October 22, 1876, at the age of 51. Once a priest, he pursued his ministry with tireless zeal. He had the Church of Our Lady of Suffrage (Nostra Signora del Suffragio) built in Turin, dedicated to the memory of soldiers who fell for the unity of Italy. He drew the plans himself and designed its monumental bell tower, the second tallest in the city, at the top of which he installed an astronomical observatory for his research. Exhausted by his multiple scientific, charitable, and pastoral activities, he died suddenly in Turin on March 27, 1888, at the age of 62, from the complications of a rapid intestinal infection, only two months after the death of his friend Saint John Bosco.

From the moment of his death, Francesco Faà di Bruno enjoyed an immense reputation for holiness among the population of Turin and the scientific community. The process for the introduction of his cause was opened in Turin. After the recognition of the heroic nature of his virtues, a miracle attributed to his intercession—consisting of the scientifically inexplicable healing of a sick person—was formally recognized by the Holy See. He was solemnly beatified on September 25, 1988, by Pope John Paul II in Saint Peter's Square in Rome, on the occasion of the centenary of his death.

The spirituality of Blessed Francesco Faà di Bruno is characterized by a remarkable synthesis between the rigor of science and the depth of faith. For him, scientific research and the contemplation of creation are paths leading directly to God. His legacy is marked by a concrete and innovative charity, particularly attentive to the dignity and social advancement of women in a society undergoing industrial change. His Marian devotion and his insistence on suffrage prayer for the deceased testify to a profound Christian hope in eternal life. Today, the Minims Sisters of Our Lady of Suffrage continue his educational and social work in Italy, as well as in Argentina, Colombia, and Romania. A museum dedicated to his dual life as a priest and scientist is open in Turin, housing his astronomy and physics instruments. He is also the official patron saint of the Italian Army Engineer Corps.