St. Paul VI, at the conclusion of the Third Session of the Second Vatican Council in 1964, declared the Blessed Virgin Mary as “Mother of the Church,” that is to say of all Christian people, the faithful as well as the pastors, who call her the most loving Mother and established that “the Mother of God should be further honored and invoked by the entire Christian people by this tenderest of titles”. But it was not until February 11, 2018, that the Congregation for Divine Worship and the Discipline of the Sacraments inscribed a new obligatory Memorial of the Blessed Virgin Mary as Mother of the Church, into the General Roman Calendar. This memorial is celebrated every year on the Monday after Pentecost, which is appropriate as Mary was also present in that room for the birthday of the Church.