Last week the Church observed the Feast of St. Leo the Great – who was pope between 440 and 461 AD. While he lived a long time ago, his influence on the Church continues right down to our own day. Indeed, he was called "the Great" because of the influence of his homilies and writings, especially about the true nature of Christ.

The Mass is one area where Pope St. Leo's influence touches us quite regularly. He did a number of things to promote the use of good music at Mass, and decreed the singing of the Gloria – which until then was only used at Christmas – at all Sunday Masses except during Advent and Lent. Pope St. Leo did these things to ensure a degree of solemnity at Mass.