The historical consensus is that Greek fire was most likely invented by Callinicus (Kallinikos) of Heliopolis, a 7th‑century Syrian Greek-speaking Jewish architect or chemist who fled to the Byzantine Empire , during the reign of Emperor Constantine IV around 672 CE.

Who “invented” Greek fire?

  • Byzantine and later medieval sources credit an artificer named Callinicus (Kallinikos) of Heliopolis with creating Greek fire after fleeing the Arab conquest of Syria in the 7th century.
  • He is usually described as an architect or chemist , bringing his secret incendiary mixture to Constantinople, where it was adopted as a state-controlled weapon.

Was it really just one inventor?

  • Some modern historians argue that Greek fire was probably not the work of a single genius , but the product of Byzantine chemists building on earlier Hellenistic and Near Eastern incendiary mixtures.
  • A historian of chemistry, James Partington, suggested it was likely developed in Constantinople’s technical circles , with Callinicus perhaps refining or popularizing an existing formula rather than creating it entirely from scratch.

What did Byzantine tradition say?

  • Byzantine writers later wrapped Greek fire in a mythic, sacred origin story , claiming its formula had been revealed by an angel to the first Christian emperor Constantine and should never be shared with non‑Christians.
  • This aura of divine secrecy helped justify its strict classification as an imperial state secret , which is one reason the exact recipe has been lost.

So, who gets the credit?

Putting it all together:

  • Name traditionally credited: Callinicus (Kallinikos) of Heliopolis , in the 7th century.
  • Modern view: he was probably a key figure , but Greek fire’s creation was likely a collaborative, evolutionary process in Byzantine science and warfare, not a lone‑inventor moment.

TL;DR: When people ask “who invented Greek fire,” the historically grounded answer is Callinicus of Heliopolis in the 7th century, though modern scholars treat that as a simplified, traditional attribution rather than a fully proven single‑inventor fact.