Callinicus of Heliopolis

Callinicus of Heliopolis was a Byzantine architect and alchemist of Jewish or Egyptian origin. He is credited with the invention of Greek fire, the premodern precedent of the flamethrower.
According to Constantine Porphyrogenitus, he arrived in Byzantium in the time of Constantine IV and shared his knowledge of liquid fire with the Byzantines. Callinicus’ exact formula was a carefully guarded secret, and remains unknown today. Possible ingredients include resin, asphalt, sulfur, naphtha, fine quicklime, and calcium phosphide.