In the Christian monastic tradition, a lorica is a prayer recited for protection. It is essentially a 'protection prayer' in which the petitioner invokes all the power of God as a safeguard against evil in its many forms. The Latin word lōrīca originally meant "armor" or "breastplate." Both meanings come together in the practice of placing verbal inscriptions on the shields or armorial trappings of knights, who might recite them before going into battle.
The idea underlying the name is probably derived from Ephesians 6:14, where the Apostle bids his readers stand, "having put on the breast-plate of righteousness,".
Similar to a litany, the lorica often listed whose protection was requested. "Gabriel be my breastplate, Michael be my belt, Raphael be my shield..."
Notable loricas include Rob tu mo bhoile, a Comdi cride, which in its English translation provides the text for the hymn Be Thou My Vision, the Lorica of Laidcenn, and the Lorica of Gildas.
The Lorica of Saint Patrick, begins:
I arise today
Through a mighty strength, the invocation of the Trinity,
Through a belief in the Threeness,
Through confession of the Oneness
Of the Creator of creation.
Linguists cannot trace this lorica back further than the eighth century, which raises the question of whether it was based on an earlier poem dating back to the time of St. Patrick (5th century), or whether actually completely unknown to the saint to whom it has been ascribed.
The Lorica of St Fursa dates from the early seventh century and is still a popular prayer in Ireland. The original text of the Fursey Lorica is held in the British Library. The translation, from Old Irish and German, was made by Fr Francis Mullaghy CSSR and Fr Richard Tobin CSSR, for use in St Joseph's Monastery, Dundalk, Co Louth. This Lorica translation is quoted by John Ó Ríordáin (3) and begins: