But an icon of the late 11th century in Saint Catherine's Monastery on Mount Sinai shows him as before, still a civilian. This may be due to iconic depiction customs on how saints are depicted. Another Sinai icon, of the Crusader period and painted by a French artist working in the Holy Land in the second half of the 12th century, shows what then became the most common depiction. Demetrius, bearded, rather older, and on a red horse, rides together with George, unbearded and on a white horse. Both are dressed as cavalrymen. Also, while George is often shown spearing a dragon, Demetrius is depicted spearing the gladiator Lyaeus ( ), who according to story was responsible for killing many Christians. Lyaeus is commonly depicted below Demetrius and lying supine, having already been defeated; Lyaeus is traditionally drawn much smaller than Demetrius. In traditional hagiography, Demetrius did not directly kill Lyaeus, but rather through his prayers the gladiator was defeated by Demetrius' disciple, Nestor. A modern Greek iconographic convention depicts Demetrius with the "Great White Tower" in the background. The anachronistic White Tower acts as a symbolic depiction of the city of Thessaloniki, despite having been built in the 16th century, centuries after his life, and the exact architecture of the older tower that stood at the same site in earlier times is unknown. Again, iconography often depicts saints holding a church or protecting a city. According to hagiographic legend, as retold by Dimitry of Rostov in particular, Demetrius appeared in 1207 in the camp of tsar Kaloyan of Bulgaria, piercing the king with a lance and so killing him. This scene, known as ("the miracle of the destruction of tsar Kaloyan") became a popular element in the iconography of Demetrius. He is shown on horseback piercing the king with his spear, paralleling the icononography (and often shown alongside) of Saint George and the Dragon. In 1962 the life and martyrdom of Demetrius became the subject of a 90-minute oratorio by Greek Diaspora composer Nicolas Astrinidis. Three parts of the work were premiered at the first Demetria Festival in Thessaloniki on 26 October 1962. The entire oratorio was premiered in 1966 and received subsequent performances in 1985 (Thessaloniki) and in 1993 (Bucharest).