One of the most popular Irish prayers for protection is St. Patrick’s Breastplate. This prayer may also be found under the name “Lorica” or “Faeth Fiada. The prayer begins as follows:
“I arise today
Through a mighty strength, the invocation of the Trinity,
Through belief in the Threeness,
Through confession of the Oneness
of the Creator of creation.
I arise today”
You can read the complete prayer here.