Today is the Feast Day of the Archangels: Saints Michael, Gabriel, and Raphael. These three archangels are held above the other Angels. I have a personally devotion to Saint Michael, in fact I chose Michael as my Confirmation name.
Here is the Prayer to St. Michael the Archangel penned by Pope Leo XIII in 1886.
English: Saint Michael the Archangel, defend us in battle, be our protection against the wickedness and snares of the devil. May God rebuke him we humbly pray; and do thou, O Prince of the Heavenly host, by the power of God, thrust into hell Satan and all evil spirits who wander through the world for the ruin of souls. Amen.
Latin: Sancte Michael Archangele, defende nos in proelio, contra nequitiam et insidias diaboli esto praesidium. Imperet illi Deus, supplices deprecamur: tuque, Princeps militiae caelestis, Satanam aliosque spiritus malignos, qui ad perditionem animarum pervagantur in mundo, divina virtute, in infernum detrude. Amen.