In 1604 the resulting new constitution of the Congrégation of St. Vanne and St. Hydulphe received papal approval.
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In the Abbey of St. Vanne near Verdun a reform was initiated by Dom Didier de la Cour, which spread to other houses in Lorraine, and in 1604 the reformed Congregation of St. Vanne was established, the most distinguished members of which were Ceillier and Calmet.
At the invitation of the Congregation of St. Basil, he set up the Pontifical Institute of Medieval Studies in Toronto in conjunction with St. Michael's College at the University of Toronto.
The abbey, dedicated to Saint Peter, was founded in 837 on both banks of the Barse by Arremar, a monk of Troyes, and remained a house of the Benedictines until 1655, when it was reformed and became part of the Congregation of St. Vanne until its dissolution in 1790.
He later joined the Congregation of St. Basil, more commonly known as the Basilian Fathers, and studied at St. Basil's Seminary in Toronto from 1963 to 1965, whence he entered the Conciliar Seminary in Mexico City.