Around the year 180 AD, the Church Father
Irenaeus, in his work
Against Heresies, wrote that "Mary become the cause of salvation, both to herself and the whole human race" given her
fiat ("let it be"). The concept was especially common in the late
Middle Ages, when it was promoted heavily among the
Franciscans, and often resisted by the
Dominicans. It is an idea which was the subject of considerable theological debate, reaching a peak in the 15th century. By the early 16th century the hopes of the concept becoming Catholic doctrine had receded, and have never seriously revived. A number of theologians have discussed the concept over the years, from the 19th-century Father
Frederick William Faber, to the 20th-century Mariologist Father
Gabriel Roschini. In his 1946 publication
Compendium Mariologiae, Roschini explained that Mary did not only participate in the birth of the
physical Jesus, but, with conception, she entered with him into a
spiritual union. The divine salvation plan, being not only material, includes a permanent spiritual unity with Christ. Most Mariologists agree with this position. The term
Co-Redemptress was used by
Pope Leo XIII in 1894: "For in the Rosary all the part that Mary took as our co-Redemptress comes to us..." In the year of 1914, the
Pope Pius X granted an indulgence to those who recited a prayer containing the following passage:
I bless thy holy Name, I praise thine exalted privilege of being truly Mother of God, ever Virgin, conceived without stain of sin, Co-Redemptrix of the human race. The prayer is found in the
Raccolta of 1950 with Vatican approval. In his encyclical on the
Immaculate Conception,
Ad diem illum, Pope Pius X said, "...since Mary carries it over all in holiness and union with Jesus Christ, and has been associated by Jesus Christ in the work of redemption, she merits for us
de congruo, in the language of theologians, what Jesus Christ merits for us
de condigno." The title tends to be most popular among conservative Catholics. :It was God's design that the Blessed Virgin Mary, apparently absent from the public life of Jesus, should assist him when he was dying nailed to the Cross. Mary suffered and, as it were, nearly died with her suffering Son; for the salvation of mankind she renounced her mother's rights and, as far as it depended on Her, offered her Son to placate divine justice; so we may well say that she with Christ redeemed mankind. The first Pope to use the term "Co-redemptrix" was
Pius XI in a
Brief dated 20 July 1925 about the Queen of the Rosary of Pompeii: "Remember also that at Calvary you became the Co-redemptrix, cooperating with the crucifixion of your heart for the salvation of the world, together with your crucified Son." In an allocution to pilgrims from
Vicenza on 30 November 1933 Pius XI said: Finally in a radio message on the occasion of the closing of the Jubilee of the Redemption at Lourdes (28 April 1935) Pius XI stated: "Mother most faithful and most merciful, who as Co-redemptrix and partaker of thy dear Son's sorrows didst assist him as he offered the sacrifice of our Redemption on the altar of the Cross ... preserve in us and increase each day, we beseech thee, the precious fruits of our Redemption and thy compassion." In his encyclical
Ad Caeli Reginam relates: In the encyclical
Haurietis Aquas Pius XII states: "For, by God's Will, in carrying out the work of human Redemption the Blessed Virgin Mary was inseparably linked with Christ in such a manner that our salvation sprang from the love and the sufferings of Jesus Christ to which the love and sorrows of His Mother were intimately united." Attempts to promote a fifth Marian dogma were undertaken in the 1920s through 1940s, but
Pius XII decided not to proceed with the definition of the dogma. the first translation into English of a volume in which the thomist theologian
Garrigou-Lagrange explained Virgin Mary's active role in divine Redemption. The concluding chapter of the
Second Vatican Council's
apostolic constitution Lumen gentium, which many theologians hold to be a comprehensive summary of
Roman Catholic Mariology, refers to Mary as "Advocate, Auxiliatrix, Adjutrix, and
Mediatrix," but does not use the term "Co-Redemptrix." Some, in particular the adherents of the
Amsterdam visions, have petitioned for a dogmatic definition of
Co-Redemptrix, along with
Mediatrix, but recent high-level comments in the church have not encouraged these hopes.
Pope John Paul II referred to Mary as "Co-redemptrix" on at least seven occasions. ==Proposed dogmatic definition==