The 150 psalms/paters were subdivided in groups of fifty. During the twelfth-thirteen centuries, the Hail Mary was added. The next step was the Marian Psalter, i.e. 150 Hail Marys (without the Our ...

Catechism of the Catholic Church, 2676-2677 Hail, Mary, full of grace, the Lord is with thee; blessed are thou among women, and blessed is the fruit of thy womb, Jesus. Holy Mary, Mother of God ...