Third stage
Some medieval theologians considered the 150 Psalms
to
be veiled mysteries about the life, death and
resurrection of
Jesus. They began to compose "Psalters of Our
Lord and
Savior Jesus Christ" - 150 praises in honor of
Jesus. Soon
psalters devoted to 150 praises of Mary were
composed.
When a psalter of 150 praises in Mary's honor
numbered
50 instead of 150, it was called a rosarium, or bouquet.