Greek Fire: Not Ancient Greece
Greek fire wasn’t wielded by Spartans or Athenians. It’s not even from ancient Greece.

Unknown — "Marble Portrait Bust of a Woman with a Scroll" (late 4th–early 5th century), public domain
Spartans never used Greek fire.
Pop culture arms every ancient Greek warrior with 'Greek fire'—the secret weapon that set fleets ablaze. You picture triremes torching Persian sails, Athens holding off Sparta with jets of flaming death. None of that happened.
It’s medieval, not classical.
Greek fire was actually invented by the Byzantine Empire in the 7th century CE, nearly a thousand years after the Parthenon rose. It was a closely guarded military secret, used to burn enemy ships. No ancient Greek hoplite or philosopher ever saw it.
How did the myth start?
The name 'Greek fire' confused generations—Byzantine Greeks used it, but they lived long after Plato. Medieval writers and later historians muddied the timeline, and modern movies did the rest.
The legendary 'Greek fire' was a Byzantine invention, centuries after Socrates or Alexander. The real recipe is still a state secret—lost to history.