St. Gregory the Great

From Once I Was a Clever Boy, a post on Pope St. Gregory the Great, whose feast is celebrated on March 12th on the calendar for the Extraordinary Form of the Latin Rite, commonly called the Traditional Latin Mass:

He must be accounted as one of the most influential of all the Popes, not merely because of the English mission sent under St Augustine in 596-7, but also because of his development of the Papal office in practical terms, his contribution to the liturgy and music of the Church and his writings as one of the Latin Doctors of the Church.

The image above is from the New Liturgical Movement website, and shows the pontiff flanked by his parents. On the current Roman Calendar for the Ordinary Form, his feast is on September 3rd.