In Roman Catholic Mariology, Mother of the Church (Latin: Mater Ecclesiae) is a title officially given to Mary by Pope Paul VI. The title was first used in the 4th century by Saint Ambrose of Milan, as rediscovered by Hugo Rahner. It was also used by Pope Benedict XIV in 1748 and then by Pope Leo XIII in 1885. Pope John Paul II placed it in the Catechism of the Catholic Church and Pope Francis added a feast by this title into the Roman Calendar.
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