Liber Ignium

The Liber Ignium ad Comburendos Hostes (translated as On the Use of Fire to Conflagrate the Enemy, or Book of Fires for the Burning of Enemies, and abbreviated as Book of Fires) is a medieval collection of recipes for incendiary weapons, including Greek fire and gunpowder, written in Latin and allegedly written by a certain Marcus Graecus ("Mark the Greek")—a person whose existence is debated by scholars. The work has been subjected to numerous academic analyses, resulting in contradictory conclusions vis-a-vis origin and influence on its contemporaries.

One of the most influential studies of the Liber Ignium was conducted by Marcellin Berthelot which is cited in 20th century works on the topic.