St. Michael the Archangel,
Origin of the St Michael Prayer
According to legend, Pope Leo XIII (reigned from 1878-1903) composed the now famous "Prayer to Saint Michael" after celebrating the Holy Sacrifice of the Mass with a group of cardinals. During the Mass, the Holy Father fell to the floor at the foot of the altar. It seemed that the Holy Father had died or suffered from a stroke. Suddenly, the Pope revived and said, "What a horrible vision I was allowed to see."
Apparently the pontiff saw a future influx of demonic forces into the Catholic Church. He subsequently authored the following prayer to Saint Michael, seeking to gain further protection for the Church. Pope Leo XIII also ordered this prayer it be prayed by the priest and faithful at the end of every low Mass.
O glorious prince St. Michael,