La Salette - Fresco about tetramorph

The tetramorph represents the four evangelists. The winged being represents St. Matthew, the lion represents St. Mark, the ox represents St. Luke, and the eagle represents St. John. These attributes were associated with evangelists by the Church Fathers (in fact, St. Irenaeus, bishop of Lyon in the 2nd century) according to the beginning of their respective Gospels.
The Gospel of St. Matthew (who was perhaps the Apostle) begins with the genealogy of Jesus and thus describes Christ's humanity. The beginning of the Gospel of St. Mark (who was a disciple of the apostle St. Peter) refers to the shout of John the Baptist in the desert, or what could be more symbolic for that shout than a lion's roar ? The Gospel of St. Luke (who was a disciple of St. Paul) begins with the sacrifice offered to God by Zechariah, and ox (or bull) may represent a sacrificed animal (the lamb is already used to represent the Christ). Finally, the Gospel of St. John (it seems to be accepted that he was the apostle) begins with the heavenly mystery, hence the association with the eagle.
It is no coincidence that these animals were specifically chosen. They had already been mentioned in the Bible, both the Old Testament with Ezekiel (Ezekiel 1, 1-14), and the New Testament with the Apocalypse (Rev. 4, 7-8) of St. John.

The mural painting was made by Arcabas.