How was the first flamethrower made?

The first flamethrower, known as the "Greek fire," was developed by the Byzantine Empire in the 7th century. It was a mixture of petroleum, quicklime, and sulfur, which was expelled through a tube and ignited, creating a powerful weapon for naval warfare. The exact recipe and method were kept secret, contributing to its effectiveness in battles. Over time, various designs evolved, leading to the modern flamethrowers used in the 20th century.