The artistic representation of holy figures on wooden boards can be traced back to the portraits of Greco-Roman antiquity. These were mostly portraits of deceased persons. Such were the portraits known as the Fayyum portraits, from the Middle Egypt area where they were found. They date from the 2nd to the 4th centuries.

The worship of the dead was a prominent feature of later Roman religious practice; and a trend adopted by the early Christians in their burial devotions for the martyrs of the new religion. It can therefore be assumed that very early on Christians worshiped the portraits of their own important dead, the martyrs and apostles, in accordance with their devotional practices. Contemporary sources inform us of the existence of icons of Christ, the Virgin Mary, the archangel Michael and other saints later on in the 4th and 5th centuries.

Among the few surviving Early Byzantine icons the most remarkable are those found in the monastery of St. Catherine on Mount Sinai. Namely, these are an icon of the enthroned Virgin holding the Holy Child and flanked by two military saints and angels; an icon of Peter the Apostle; and one of Christ Pantokrator (omnipotent). All three icons are examples of the encaustic technique, which consists of colours mixed with molten wax and then spread on the surface of the painting while the mixture was still hot. A preparatory linear drawing was not required in this technique and colour lent volume and natural substance to images.

These elements are evident in the three icons mentioned above. Soft hues, the depiction of faces and the architectural depth created by perspective bring these masterpieces very close to the Hellenistic tradition. Dating back to the 6th century, the Sinai icons probably came from a Constantinople workshop.