St. Patrick, by virtue of his purported use of the shamrock to explain the Mystery of the Holy Trinity, has almost come to be synonymous with the Trinity.  Another legacy of the saint:  St. Patrick's Breastplate, an "Old Irish" lorica" which St. Patrick is credited with having composed.  Lorica is translated as shield or breastplate.      This long prayer has also been called the Deer's Cry.  The reason:  there is a collection of hymns...

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