The Shield of the Trinity Fig 1

 First Sunday after Pentecost in the Western Christian liturgical Calendar  Christian Doctrine of the Trinity: The Father, The Son and The Holy Spirit Fig 2

 Prior to reforms of Second Vatican Council: Marks the end of a three-week period when church weddings were forbidden  Began on Rogation Sunday, the fifth Sunday after Easter.

 Double of the Second Class by Pope John XXII  Double of the First Class by Pope St Pius X on 24 July Fig 3Fig 4

 In the traditional Divine Office, Athanasian Creed (Quicunque vult) is said on this day at Prime.  Before 1960 reforms, it was said on all Sundays after Epiphany and Pentecost Fig 5

 Christian statement of belief, focusing on Trinitarian doctrine and Christology  Latin name taken from the opening words "Whosoever wishes."  First creed in which the equality of the three persons of the Trinity is explicitly stated

 Early Church: No special Office or day was assigned for the Holy Trinity  During the Arian heresy, the Fathers prepared an Office with canticles, responses, a Preface, and hymns Fig 6

 The Micrologies (P.L., CLI, 1020), written during the pontificate of Gregory VII call the Sunday after Pentecost a Dominica vacans, with no special Office  Alexander II ( ), refused a petition for a special feast on the plea, as Roman Church daily honoured the Holy Trinity by the Gloria Patri

 John XXII ( ) ordered the feast for the entire Church on the first Sunday after Pentecost  After the first great Pentecost that the doctrine of the Trinity was proclaimed to the world, the feast becomingly follows that of Pentecost

 Trinity Sunday  Liturgy of the Hours  Athanasian Creed  History ml ml

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 Catholic Encyclopedia  Newadvent.org  The Holy Trinity: In Scripture, History, Theology And Worship (Paperback) by Robert Letham