The principal author of this book, Father Aladel, was a member of the Congregation of the Mission founded by Saint Vincent de Paul. More importantly, he was the spiritual director and confessor of Saint Catherine Laboure. The Miraculous Medal was designed by the Mother of God and communicated by her to Sister Catherine with the instruction that this devotion be spread throughout the Church. The inscription: O Mary conceived without sin pray for us who have recourse to thee, anticipated the definition of the Immaculate Conception by nearly a quarter of a century. This book relates not only the heavenly visitations given to this humble saint, as well as her adventures and crosses endured for Our Lady’s cause, but also it gives the ensuing history of the medal itself with many accounts of miracles which accompanied its pious reception.