Pope Leo XIII is known for his devotion to St. Michael. He is the one who first asked the Prayer to St. Michael to be added to the Prayers after the Mass and later, he also composed and promulgated an Exorcism against the devil which includes a special Prayer to St. Michael. In 1886, after celebrating his Mass, the Pope had a horrific vision of demonic spirits congregating in Rome. This vision had a great impression on Leo XIII and prompted him to write, promulgate the Saint Michael prayer. He ordered the Prayer to Saint Michael be added to the Leonine Prayers. The prayer's opening words are similar to the Alleluia verse for Saint Michael’s feasts on 29 September in the Roman Missal.

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• Side-seamed