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Saint Demetrius, Byzantine Steatite Icon

A larger detail of Saint Demetrius of Thessalonica, Byzantine Steatite Icon, 13th-14th Century. Kremlin, Moscow.

6. Icons of the state treasury: St Demetrius of Thessalonica. Steatite icon, the 13th-14th century.
Source: The Moscow Kremlin Museums collections come to London

Saint on horseback. Demetrius with a sword and a padded cuirass. Steatite (soapstone), Kremlin, Moscow.
Source: protostrator. Soapstone Warriors (military saints in byzantine carved icons)

Fig. 51. St Demetrios on horseback, 13th/14th-century steatite icon; Armoury of the Moscow Kremlin.
Source: Arms and Armour of the Warrior Saints (Medieval Mediterranean)

Referenced on pp.8-9, MAA 89 Byzantine Armies 886-1118 by Ian Heath & Angus McBride:
Though Byzantine artists do not seem to have normally considered soldiers as suitable subjects they nevertheless drew, carved and painted endless numbers of military saints. This is one of them, St Demetrius, from an 11th-century ikon. He carries a large circular shield and wears quilted body-armour, probably an epilorikion. Note also his horse’s tied tail. A helmet would normally be worn, but saints are usually bareheaded in Byzantine art.

See also Saint George, Mounted, Byzantine Mural, Saint John Chrysostom Church, Geraki, Morea, Greece, c.1300AD.
Other 13th Century Illustrations of Costume & Soldiers
Byzantine Illustrations of Costume & Soldiers