The Byzantine Empire used the deadly weapon called fire to defeat their enemies.

The question asks us to name the deadly weapon which was used by the Byzantine Empire. Greek fire was a deadly weapon used by the Byzantine Empire. it was created in the 7th century to protect the Constantinople during the Arab siege. The Byzantians used it in naval battles, because it could burn while floating on the water. The composition of Greek fire is unknown. It could include combinations of naphtha, calcium phosphate, sulfur or niter. Answer: Greek fire.