Solemnity of Mary, Mother of God

The Solemnity of Mary, the Holy Mother of God is a feast day of the Blessed Virgin Mary under the aspect of her motherhood of Jesus Christ, whom Christians see as the Lord, Son of God. It is celebrated by the Roman Rite of the Catholic Church on 1 January, the Octave (8th) day of Christmastide. The solemnity is a Holy Day of Obligation in areas that have not abrogated it.

Christians of Byzantine Rite and of all West Syriac and East Syriac rites celebrate Mary as Mother of God on 26 December and the Coptic Church does so on 16 January. The Eastern Orthodox Church, Anglican Communion and the Lutheran Church observe the Feast of the Circumcision of Christ on 1 January.

The feast is a celebration of Mary's motherhood of Jesus. The English title "Mother of God" is a literal translation of the Latin title Mater Dei, which in turn is a rendering of the Greek title Θεοτόκος (Theotokos), meaning "Bearer of God" dogmatically adopted by the First Council of Ephesus (431) as an assertion of the divinity of Christ.

The Second Vatican Council stated: "Clearly from earliest times the Blessed Virgin is honoured under the title of Mother of God." and at an early stage the Church in Rome celebrated on 1 January a feast that it called the anniversary (Natale) of the Mother of God. When this was overshadowed by the feasts of the Annunciation and the Assumption, adopted from Constantinople at the start of the 7th century, 1 January began to be celebrated simply as the octave day of Christmas, the "eighth day" on which, according to Luke 2:21, the child was circumcised and given the name Jesus.

In the 13th or 14th century, 1 January began to be celebrated in Rome, as already in Spain and Gaul, as the feast of the Circumcision of the Lord and the Octave of the Nativity, while still oriented towards Mary and Christmas, with many prayers, antiphons and responsories glorifying the maternity of Mary. Pope John XXIII's 1960 rubrical and calendrical revision removed the mention of the circumcision of Jesus and called 1 January simply the Octave of the Nativity.

The Solemnity of Mary, Mother of God is a liturgical celebration. It is a holy day of obligation for Catholics, meaning that Mass attendance is required. The use of the word “Solemnity” here is a designation used for certain days within the liturgical (church-based) calendar of the Church. Solemnities are the highest rank of liturgical celebration, higher than feast days or memorials. By celebrating a solemnity dedicated to Mary’s motherhood, the Church highlights the significance of her part in the life of Jesus, and emphasizes that He is both human and divine.

Jesus’ nature as both and equally human and divine is something we may take for granted today. But back in the early days of the church, this dogma of our faith was hotly debated. In 431 A.D. during the Council of Ephesus, the title of “Mary Mother of God,” in Greek “Theotokus,” was defended and defined against the heresy of Nestorius. Nestorius, Bishop of Constantinople, refuted the title of “Theotokus” claiming that Christ had two loosely united natures, and therefore, Mary was only the mother of the human part of Him.

Catholic theologians rejected this claim, and defined that Christ indeed has two natures, a divine nature and a human nature definitely united in one divine person, and since Christ’s two natures form one single person, Mary is the mother of the whole Person of Christ.

Therefore, Mary can be properly called “Mother of God,” not in the sense that she came before God or is the source of God, but in the sense that the Person that she bore in her womb is indeed true God and true man.

When Catholics celebrate the Solemnity of Mary Mother of God we are not only honoring Mary, who was chosen among all women throughout history to bear God incarnate, but we are also honoring our Lord, who is fully God and fully human.

Calling Mary "mother of God" is the highest honor we can give Mary. Just as Christmas honors Jesus as the "Prince of Peace," the Solemnity of Mary Mother of God honors Mary as the "Queen of Peace."

Pope Paul VI, in his apostolic exhortation Marialis Cultus (1974), called the Solemnity of Mary “a fitting occasion for renewing adoration of the newborn Prince of Peace, for listening once more to the glad tidings of the angels (cf.Lk 2:14), and for imploring from God, through the Queen of Peace, the supreme gift of peace.”