Q. 1. What are the 15 promises of the Rosary?

A. 1. It is alleged that Our Lady made 15 promises to St. Dominic and Blessed Alan de la Roche.

Those promises were:

1) To all those who shall recite my Rosary devoutly, I promise my special protection and very great graces.

2) Those who shall persevere in the recitation of my Rosary shall receive some signal grace.

3) The Rosary shall be a very powerful armor against hell; it will destroy vice, deliver from sin, and dispel heresy.

4) The Rosary will make virtue and good works flourish, and will obtain for souls the most abundant Divine mercies; it will substitute in hearts love of God for love of the world, and will lift them to the desire of heavenly and eternal things. How many souls shall sanctify themselves by this means!

5) Those who trust themselves to me through the Rosary, shall not perish.

6) Those who shall recite my Rosary devoutly, meditating on its mysteries, shall not be overwhelmed by misfortune. The sinner shall be converted; the just shall grow in grace and become worthy of eternal life.

7) Those truly devoted to my Rosary shall not die without the Sacraments of the Church.

8) Those who recite my Rosary shall find during their life and at their death the light of God, the fullness of His graces, and shall share in the merits of the blessed.

9) I shall deliver very promptly from purgatory the souls devoted to my Rosary.

10) The true children of my Rosary shall enjoy great glory in heaven.

11) What you ask through my Rosary, you shall obtain.

12) Those who propagate my Rosary shall be aided by me in all their necessities.

13) I have obtained from my Son that all the members of the Rosary Confraternity shall have for their brethren the saints of heaven during their life and at the hour of death.

14) Those who recite my Rosary faithfully are all my beloved children, the brothers and sisters of Jesus Christ.

15) Devotion to my Rosary is a great sign of predestination.

History

Alanus de Rupe (Alain de la Roche) was a 15th-century Dominican preacher, best known for his efforts to promote the Rosary. Alanus claimed to have experienced a vision by which it was revealed to him that the Blessed Virgin Mary had appeared to St. Dominic and gave him the Rosary as a means to combat the Albigensian movement. Alanus de Rupe's revelation concerning St. Dominic and the Rosary was generally accepted until the 17th century when the Bollandists concluded that the account of Dominic's supposed apparition of Our Lady of the Rosary is not mentioned in any documents of the Church or Dominican Order prior to the accounts of Alanus over two hundred years later.

A popular prayer card listing the promises bears the imprimatur ("let it be printed") of Patrick J. Hayes DD who was Archbishop of New York from 1919 to 1938. It was issued after a finding of "nihil obstat" (nothing obstructs) by an archdiocesan censor who reviewed the material to determine if it contradicted Catholic teaching. Neither a "nihil obstat" nor an "imprimatur" would necessarily reflect the personal opinion of either the censor or the archbishop regarding the document reviewed. Hayes' predecessor, John Cardinal Farley, issued an imprimatur for the edition of the Catholic Encyclopedia that holds the Rosary promises as not historical.

The 15 promises fall under the category of "private revelation", and as such are a pious tradition, which a person is free to believe or not believe.

[Source: https://en.wikipedia.org/wiki/Fifteen_rosary_promises]