Why do we have the Dominican rosary? In short, we received the rosary from Our Lady via St Dominic as he prayed and did penance for the conversion of sinners during the Albigensian heresy that was plaguing Europe during the 13the century. After having done harsh penance, “Our Lady appeared to him, accompanied by three angels, and she said, “Dear Dominic, do you know which weapon the Blessed Trinity wants to use to reform the world?” “Oh, my Lady,” answered Saint Dominic, “you know far better than I do, because next to your Son Jesus Christ you have always been the chief instrument of our salvation.” Then Our Lady replied, “I want you to know that, in this kind of warfare, the principal weapon has always been the Angelic Psalter, which is the foundation-stone of the New Testament. Therefore, if you want to reach these hardened souls and win them over to God, preach my Psalter.” So he arose, comforted, and burning with zeal for the conversion of the people in that district, he made straight for the cathedral. At once unseen angels rang the bells to gather the people together, and Saint Dominic began to preach” (MotherTeresa.org).