The paper deals with a theology of Transfiguration. It points out its mutual theological affinity with the Baptism and Gethsemane Agony scenes within Synoptic Gospels as well as with Glorification in John 12. The first artistic image of Transfiguration in the Basilica di Sant’ Apollinare in Classe, about 550, presents a theologically generalized image of Jesus by means of allegory, whereas the next attempt in St Katharina of Sinai, about 565, tends to overcome symbolism and allegory by means of iconography.