05/31/2026
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Pope Francis decreed in 2018 that the Memorial of the Blessed Virgin Mary, Mother of the Church, be celebrated every year on the Monday after Pentecost. The story behind Mater Ecclesiae is older than Pope Francis. At Vatican II, Pope Paul VI formally proclaimed Mary “Mother of the Church” in 1964, meaning Mother of all Christian people, both faithful and pastors. Pope Francis later placed that title into the universal Roman Calendar so the whole Church would celebrate it annually.
The image you mention is the Mater Ecclesiae mosaic in St. Peter’s Square. After the assassination attempt against Pope John Paul II on May 13, 1981, he wanted an image of Our Lady placed in the square because he believed the Virgin Mary had protected him. The mosaic was made in 1981 and placed on the façade between the San Damaso courtyard and St. Peter’s Square.
Under the image are John Paul II’s coat of arms and his motto Totus Tuus—written on the mosaic as TOTVS TVVS, using the old Latin style where V is used for U. Totus Tuus means “Totally yours” or “All yours.” John Paul II explained that these words mean “total belonging to Jesus through Mary.” Beneath the mosaic is the inscription Mater Ecclesiae, Latin for Mother of the Church.
We have beautiful cards of Mary, Mother of the Church https://www.ewtnreligiouscatalogue.com/mater-ecclesiae-note-cards-pack-of-six/p/SPCCRDA4094X