De Granier died in September 1602, and the new bishop entered on the administration of his vast diocese, which, as a contemporary says, "he found brick and left marble." His first efforts were directed to securing a virtuous and well-instructed clergy, with its consequence of a people worthy of their pastors. All his time was spent in preaching, confessing, visiting the sick, relieving the poor. His zeal was not confined to his diocese. In concert with Jeanne Francoise Fremyot (1572-1641), widow of the baron de Chantal, whose acquaintance he made while preaching through Lent at Dijon in 1604, he founded the order of the Visitation, in favour of "strong souls with weak bodies," as he said, deterred from entering the orders already existing, by their inability to undertake severe corporal austerities. The institution rapidly spread, counting twenty houses before his death and eighty before that of St Jeanne. The care of his diocese and of his new foundation were not enough for his ardent charity, and in 1609 he published his famous _Introduction to a Devout Life_, a work which was at once translated into the chief European languages and of which he himself published five editions. In 1616 appeared his _Treatise on the Love of God_, which teaches that perfection of the spiritual life to which the former work is meant to be the "Introduction." The important Lents of 1617 and 1618 at Grenoble were a prelude to a still more important apostolate in Paris, "the theatre of the world," as St Vincent de Paul calls it. This third visit to the great city lasted from the autumn of 1618 to that of 1619; the direct object of it was to assist in negotiating the marriage of the prince of Piedmont with Chretienne of France, but nearly all his time was spent in preaching and works of mercy, spiritual or corporal. He was regarded as a living saint. St Vincent scarcely left him, and has given the most extraordinary testimonies (as yet unpublished) of his heroic virtues. Mere Angelique Arnaud, who at this time put herself under his direction and wished to join the Order of the Visitation, attracted by its humility and sweetness, may be named as the most interesting of his innumerable penitents of this period. He returned to Savoy, and after three years more of unwearying labour died at Lyons on the 28th of December 1622. A universal outburst of veneration followed; indeed his cult had already begun, and after an episcopal inquiry the pontifical commission in view of his beatification was instituted by decree of the 21st of July 1626, a celerity unique in the annals of the Congregation of Rites. The depositions of witnesses were returned to Rome in 1632, but meantime the forms of the Roman chancery had been changed by Urban VIII., and the advocates could not at once continue their work. Eventually a new commission was issued in 1656, and on its report, into which were inserted nineteen of the former depositions, the "servant of God" was beatified in 1661.