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Callinicus Of Heliopolis (born ad 673) was an architect who is credited with the invention of Greek fire, a highly incendiary liquid that was projected from “siphons” to enemy ships or troops and was almost impossible to extinguish. Born in Syria, Callinicus was a Jewish refugee who was forced to flee the Arabs to Constantinople. The ingredients of Greek fire were kept a state secret, known only by the Byzantine emperor and Callinicus’ family, which...