Trinity Sunday is a day that celebrates the central dogma of Christian theology: that the One God exists as three persons with one substance—as the Father, the Son, and the Holy Spirit. The idea of a festival in honor of the Trinity was first introduced by Stephen, bishop of Liège, Belgium, in the 10th century. But it wasn't until 1334 that it became a universal observance decreed by Pope John XXII. The day after Trinity is sometimes referred to as Trinity Monday. Tradition has it that St. Patrick of Ireland used a shamrock as a symbol of the "three-in-one," triune God. Discussfrom Today's Holiday http://ift.tt/2sPVLuL
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