This is Italian artist Titian's depiction of the Transfiguration of Jesus Christ with Moses at the upper left, Elijah at the upper right and the Apostles Peter, James and John in the foreground.
The Gospel of the Second Sunday of Lent always features Jesus’ Transfiguration. Why the Transfiguration is so important in the context of Lent is suggested at the end of today’s Gospel from Mark ...