The Church has traditionally portrayed the Blessed Virgin Mary together with the apostles and disciples gathered at that first Pentecost, joined in prayer with the first members of the Church. The title Mater Ecclesiae is found in the writings of Berengaud, bishop of Treves. In the 1895 encyclical Adjutricem populi Pope Leo XIII wrote, "She is invoked as Mother of the Church and the teacher and Queen of the Apostles". Following the title's usage by Leo XIII, it was later used many times in the teachings of John XXIII and Paul VI, John Paul II and Benedict XVI. The use of the Mater Ecclesiae title to the Virgin Mary goes back to Ambrose of Milan in the 4th century, but this was not known until its 1944 rediscovery by Hugo Rahner. Rahner's Mariology, following Ambrose, sees Mary in her role within the Church. His interpretation, based solely on Ambrose and the early Fathers, greatly influenced Vatican II and Pope Paul VI, who, quoting Ambrose, declared Mary the "Mother of the Church".
Pope Paul VI
A former archbishop of Milan, Paul VI used similar language to that of Saint Ambrose of Milan, calling Mary Model of the Church in light of her faith, love and complete unity with Christ and Mother of the Church because she gave birth to Christ. During his speech upon the closing of the third session of the Second Vatican Council on November 21, 1964, Paul VI said: "We declare Mary Most Holy Mother of the Church, that is, of all the Christian people" In Redemptoris MaterPope John Paul II referred to Paul VI's "Credo of the People of God" as a reaffirmation of the statement that Mary is the "mother of the entire Christian people, both faithful and pastors" and wrote that the Credo "restated this truth in an even more forceful way":
Pope John Paul II
In 1980, during the UNIV Forum, an annual gathering of university students from all over the world held in Rome during Holy Week and born by inspiration of Saint Josemaría Escrivá, founder of Opus Dei, a young man taking part in the gathering told Pope John Paul II that he was not able to find an image of Our Lady in St. Peter's Square, heart of Christendom. In fact, although there are 162 statues of saints, none of them depict the Mother of God. The pope answered immediately: "then we should finish the square". When Blessed Álvaro del Portillo, successor of Saint Josemaría Escrivá, heard this story, he asked the Spanish architect Javier Cotelo to find a good solution for the image. In July 1980 and January 1981, Cotelo submitted to the pope a proposal of using one of the windows of the building located between St. Peter's Square and the Cortile di San Damaso, since from there the image could be seen from any part of the square. The pope accepted the suggestion and on December 7, 1981, a mosaic of Maria Mater Ecclesiae – Our Lady, Mother of the Church – was installed following Cotelo's proposal. On the following day, the feast of the Immaculate Conception, the pope blessed the mosaic from his window; this mosaic is considered to be last stone of St. Peter's Square]. Moreover, this mosaic overlooking the square follows the 1981 assassination attempt on Pope John Paul II's life. It is also a tribute to the intercession of Our Lady in saving his life. In 1987, John Paul repeated this title Mother of the Church in his encyclical Redemptoris Mater and at a general audience on September 17, 1997. With regard to the title "Mother of the Church", John Paul used Redemptoris Mater as an opportunity to explain how the Blessed Virgin Mary's maternity of Christ's faithful derives from her maternity of Christ, as well as how Mary serves as a "type", or model, of the Church as a whole. On September 17, 1997, Pope John Paul II devoted a Wednesday general audience to the title "Mother of the Church" with regard to its application to the Blessed Virgin Mary.
Pope Benedict XVI referred to the Credo of Paul VI and stated that it sums up all of the scriptural texts that relate to the matter. Benedict addresses the issue, why Roman Catholic Mariology is related to ecclesiology, the teaching about the Church. On first sight, he argues, it may seem accidental, that the Council moved Mariology into ecclesiology. This relation helps to understand what "Church" really is. The theologian Hugo Rahner showed that Mariology was originally ecclesiology. The Church is like Mary. The Church is virgin and mother, she is immaculate and carries the burdens of history. She suffers and she is assumed into heaven. Slowly she learns, that Mary is her mirror, that she is a person in Mary. Mary on the other hand is not an isolated individual, who rests in herself. She is carrying the mystery of the Church.
Pope Francis
In 2018, Pope Francis decreed that the Memorial of the Blessed Virgin Mary, Mother of the Church be inserted into the Roman Calendar on the Monday after Pentecost and to be celebrated every year. The decree was signed on February 11, 2018, the memorial of Our Lady of Lourdes, at the 160th anniversary of the Lourdes apparitions. It was issued on March 3, 2018.
