Laidcenn mac Buith Bannaig
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Laidcenn mac Buith Bannaig of Clonfert-Mulloe, died 661, is the ascribed author of the earliest survived example of a loricae, or breastplate, a term applied to a genre of charm-prayers, derived from the Pauline conception of life as an armed struggle. The most well-known loricae is St. Patrick's Breastplate, which however has no connection to the saint.
[edit] Source
Oxford Concise Companion to Irish Literature, Robert Welsh, 1996. ISBN 0-19-280080-9