St. John was born at Ri, France on November 14th, 1601. At the age of fourteen he took a vow of chastity and since the time he was a child he tried to live in imitation of the Lord Jesus. When he was ordained a priest in 1625, at the age of 24, he was immmediately thrust into the service of victims of the plague, whom he cared for at great risk to his own life. He also began preaching missions and was known as the greatest preacher of his age, preaching missions all over France, especially throughout Normandy.
In 1641 he founded the Congregation of Our Lady of Charity of the Refuge, to provide a refuge for prostitutes. In 1643 he founded the Society of Jesus and Mary for the education of priests and for missionary work.
He was also instrumental in encouraging devotion to the Sacred Heart of Jesus and the Holy Heart of Mary, writing the first book ever on the devotion to the Sacred Hearts, "Le Coeur Admirable de la Très Sainte Mère de Dieu". He died at Caen, on August 19th, 1680.
His virtues were declared heroic by Leo XIII, on January 6th, 1903. The miracles proposed for his beatification were approved by Pius X, May 3, 1908, and he was beatified April 25th, 1909. He was canonized in 1925.
