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Fresco from the north choir of the Dečani church nave, Monastery St. Theodore Tiro (Tyro), Visoki Dečani, Serbia.
Source.
Referenced on p.34, Byzantine Armies AD 1118-1461 by Ian Heath & Angus McBride
Although from a 14th century Serbian mural, these military saints could as easily be Byzantines. They wear lamellar corselets and are armed with lance, sword and composite bow. The main figure has his helmet suspended by its chin-strap.