The theme of the Madonna and Child was rare in the first centuries of early Christian art (c. 3rd–6th century). In 431, however, the establishment of Mary’s title of Theotokos (“Mother of God”) definitively affirmed the full deity of Christ. Thereafter, to emphasize this concept, an enthroned Madonna and Child were given a prominent place in monumental church decoration. More
Saint Demetrius of Thessaloniki is a Christian martyr of the early 4th century AD. During the Middle Ages, he came to be revered as one of the most important Orthodox military saints, often paired with Saint George. In the Roman Catholic church he is most commonly called "Demetrius of Sermium."
The earliest written accounts of his life were compiled in the 9th century, although there are earlier images of him, and the 7th-century Miracles of Saint Demetrius collection. According to these early accounts, Demetrius was born to pious Christian parents in Thessaloniki, Illyricum in 270. The biographies have Demetrius as a young man of senatorial family who was run through with spears in around 306 AD in Thessaloniki, during the Christian persecutions of Diocletian and Galerian.
St. Demetrius was initially depicted in icons and mosaics as a young man in patterned robes with the distinctive tablion of the senatorial class across his chest. Miraculous military interventions were attributed to him during several attacks on Thessaloniki, and he gradually became thought of as a soldier: a Constantinopolitan ivory of the late 10th century shows him as an infantry soldier (Metropolitan Museum of Art). But an icon of the late 11th century in Saint Catherine's Monastery on Mount Sinai shows him as before, still a civilian. More