Proceedings to beatify John began between 1614 and 1616. He was eventually beatified in 1675 by Pope Clement X, and was canonized by Benedict XIII in 1726. When his feast day was added to the General Roman Calendar in 1738, it was assigned to 24 November, since his date of death was impeded by the then-existing octave of the Feast of the Immaculate Conception. This obstacle was removed in 1955 and in 1969 Pope Paul VI moved it to the "dies natalis" (birthday to heaven) of John, 14 December. The Church of England commemorates him as a "Teacher of the Faith" on the same date. In 1926, he was declared a Doctor of the Church by Pope Pius XI after the definitive consultation of Reginald Garrigou-Lagrange O.P., professor of philosophy and theology at the Pontifical University of Saint Thomas Aquinas, "Angelicum" in Rome.