Mariology of the saints Marian veneration is the best. Canisius tried to show a practical rationale for Marian devotion and defended it against opposing Protestant arguments. His lasting contribution to this "applied mariology" are his three catechisms, which he published in Latin and German, and which became widespread and popular in Catholic regions. Under the heading "prayer" he explains the Ave Maria, (Hail Mary), as the basis for Catholic Marian piety. Less known are his Marian books, in which he published prayers and contemplative texts. He is credited with adding to the Hail Mary the sentence "Holy Mary, Mother of God, pray for us
Veneration of Mary in the Catholic Church and memorials in the General Roman Calendar of the Catholic Church are: A large number of titles to honor Mary or ask for her intercession are used by Roman Catholics. While "Mater Dei" (i.e. "Mother of God" as confirmed by the First Council of Ephesus, 431) is common in Latin, a large number of other titles have been used by Roman Catholics – far more than any other Christians. Titles used to refer to the Virgin Mary throughout history, at times reflect the changing attitudes towards her. "Domina" (lady), "Regina" (queen) and "Stella Maris" (star of the sea) are some