One of the most common motifs of Christian art is the almost omnipresent Tetramorph. From the Greek tetra (“four”) and morphé (“form,” or “shape”) the word applies, in general, to any representation of a set of four elements.
But in Christian art, the Tetramorph refers almost exclusively to the most common way to depict the four Evangelists, each one of them either accompanied or represented by a figure, three of them being animals and only one (the one that either accompanies or represents Matthew) human or, more often than not, a winged angelic figure.
Such images, unlike some other traditional zoomorphic motifs of Christian art, have biblical bases. They correspond to the vision of the so-called “four living beings” of Ezekiel: the prophet describes four beings: “As for the appearance of their faces: the four had the face of a human being, the face of a lion on the right side, the face of an ox on the left side, and the face of an eagle” (Ezekiel 1:10). This tetramorph bore the throne or chariot of the Lord.
One can only wonder where Ezekiel got such complex images from.
We all know the combination of different beings and symbols was quite common in ancient Egypt, as well as in ancient Mesopotamia. Let us remember the Egyptian sphinxes, winged Babylonian bulls and Greek harpies. Interestingly Ezekiel himself was one of the Jewish prophets who lived during the exile in Babylon around the 6th century before Christ, so his vision could have been influenced (Bible scholars claim) by the ancient motifs of Assyrian art, in which these combinations were indeed quite common.