FOUNDRESS AND PATRONESS OF SOCIAL WORKERS
M. Le Gras died on 21 December, 1625, after a long illness. In the meantime his wife had made the acquaintance of a priest known as M. Vincent (St. Vincent de Paul), who had been appointed superior of the Visitation Monastery by St. Francis of Sales. She placed herself under his direction, probably early in 1625. His influence led her to associate herself with his work among the poor of Paris, and especially in the extension of the Confrérie de la Charité, an association which he had founded for the relief of the sick poor. It was this labour which decided her life's work, the founding of the Sisters of Charity. The history of the evolution of this institute, which Mlle Le Gras plays so prominent a part, has been given elsewhere (see Charity, Sister of); it suffices here to say that, with formal ecclesiastical and state recognition, Mlle Le Gras' life-work received its assurance of success. Her death occurred in 1660, a few month before the death of St. Vincent, with whose labours she had been so closely united.
(Taken From Catholic Encyclopedia)