The Breastplate or Lorica of St. Patrick (Fáeth Fiada)

Trinity College Dublin MS 1441, fol. 19v

Atomeriug indíu

niurt trén togairm trinoit

cretim treodataid

fóisin óeridatad

in dúlemain dail. . . .

But it probably wasn't composed by St. Patrick (ODCC, 3rd ed., rev. (2005):  "its ascription to St. Patrick is impossible on linguistic grounds").

     Critical editions of the original (early 8th-century) Old Irish:

• Bernard, J. H. & R. Atkinson, eds. The Irish Liber Hymnorum.   Henry Bradshaw Society 13–14.

• Vol. 1 (1897), pp. 133–136: Old Irish.

• Vol. 2 (1897), pp. 49–51: English.

• Vol. 2 (1897), pp. 208–212: notes.

• Stokes, Whitley, & John Strachan, eds. Thesaurus Palaeohibernicus: a collection of Old-Irish glosses scholia prose and verse.  Vol. 2, Non-biblical glosses and scholia, Old-Irish prose, names of persons and places, inscriptions, verse, indexes (1903), pp. 354-358.  Bieler (below) called this in 1953 "the most accurate [translation] in existence" (68).

     Manuscripts (in progress):

• c. 1000:  Dublin:  Trinity College Manuscripts and Archives Research Library TCD MS 1441, formerly E.4.2 (and other shelfmarks listed at the link).  Digitization here (the Lorica covers fol. 19v-20r).
• 15th/16th cent.:  Oxford:  Bodleian Library MS Rawl B 512.
• 15th/16th cent:  London:  British Library Egerton MS 93.

     Additional translations into English (in progress):

• Bieler, Ludwig, trans.  The works of St. Patrick; St. Secundinus, Hymn on St. Patrick.  Ancient Christian writers 17.  New York:  Paulist Press, 1953.  Pp. 67-72.
• Stokes, Whitley, trans. (above).  Reprinted in J. H. Todd, St. Patrick, apostle of Ireland (1864), 426-429.  Cf. this with the translation in Whitley & Strachan (which Bieler in 1953 called "the most accurate [translation] in existence"), above.
• Petrie, George.  "On the history and antiquities of Tara Hill."  Transactions of the Royal Irish Academy 18.Antiquities (1839):  56-68 (25-232).  The Breastplate or Lorica of St. Patrick was first published here in 1839.

     Additional bibliography (in progress):

• Watson, J. R.  "I bind unto myself today."  Canterbury Dictionary of Hymnology.
• Binchy, D. A. "Varia III.3. Atomriug-4. The date of the so-called 'Hymn of Patrick.'"  Ériu 20 (1966):  232–237 (229-237).  This is the work of scholarship on which the ODCC grounds its claim that St. Patrick could not have been the author.