God has created various orders of Angels. Sacred Scripture distinguishes nine groupings: Seraphim, Cherubim, Thrones, Dominations, Powers, Virtues, Principalities, Archangels and Angels (Isaiah 6:2; Genesis 3:24; Colossians 1:16; Ephesians 1:21; Romans 8:38). There may be more groupings but these are the only ones that have been revealed to us. The Seraphim are believed to be the highest choir, the most intimately united to God, while the Angelic Choir is the lowest.
The history of this chaplet goes back to a devout servant of God, Antonia d'Astonac, who had a vision of Saint Michael. He told Antonia to honor him by nine salutations to the nine Choirs of Angels. Saint Michael promised that whoever would practice this devotion in his honor would have, when approaching Holy Communion, an escort of nine angels chosen from each of the nine choirs. In addition, for those who would recite the chaplet daily, he promised his continual assistance and that of all the holy angels during life.