Trinity Sunday

Trinity Sunday the octave day of the feast of Pentecost. The introduction of this day into the calendar is of comparatively recent date, it being established by pope Benedict XI, A.D. 1305. It is probable that the zeal of many Christians against the use of images in the 8th and 9th centuries may have been the first cause of the appointment of a distinct day for meditating upon the nature of the Holy Trinity in unity, or the one true God, as distinguished from all idols. The reason for its late introduction is that in the creed of the Church, and in its psalms, hymns, and doxologies, great prominence was given to this doctrine, and it was thought that there was no need to set apart a particular day for that which was done every day.