1. The Shield of the Trinity Fig 1

2.  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

3.  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.

4.  Double of the Second Class by Pope John XXII  Double of the First Class by Pope St Pius X on 24 July 1911. Fig 3Fig 4

5.  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

6.  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

7.  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

8.  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 (1061-1073), refused a petition for a special feast on the plea, as Roman Church daily honoured the Holy Trinity by the Gloria Patri

9.  John XXII (1316-1334) 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

10.  Trinity Sunday http://en.wikipedia.org/wiki/Trinity_sunday, http://www.newadvent.org/cathen/15058a.htmhttp://en.wikipedia.org/wiki/Trinity_sunday http://www.newadvent.org/cathen/15058a.htm  Liturgy of the Hours http://en.wikipedia.org/wiki/Liturgy_of_the_Hours http://en.wikipedia.org/wiki/Liturgy_of_the_Hours  Athanasian Creed http://en.wikipedia.org/wiki/Athanasian_Creed, http://www.catholic.org/encyclopedia/view.php?id=1198 http://en.wikipedia.org/wiki/Athanasian_Creed http://www.catholic.org/encyclopedia/view.php?id=1198  History http://www.catholicity.com/encyclopedia/t/trinity_sunday.ht ml http://www.catholicity.com/encyclopedia/t/trinity_sunday.ht ml

11.  Fig 1: http://en.wikipedia.org/wiki/File:Shield-Trinity-Scutum-Fidei-basic.png  Fig 2: http://www.therealpresence.org/essentials/creed/acc02.htm  Fig 3: http://www.absoluteastronomy.com/topics/Avignon_Papacyhttp://www.absoluteastronomy.com/topics/Avignon_Papacy  Fig 4: http://www.hscdsb.on.ca/schools/school.aspx?l=,1,2,12,166,167,1 214 http://www.hscdsb.on.ca/schools/school.aspx?l=,1,2,12,166,167,1 214  Fig 5: http://en.wikipedia.org/wiki/File:Athanasius_I.jpg  Fig 6: http://www.cab.u-szeged.hu/wm/paint/auth/greco/

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