The word "grenade" derives from the French word for a "small explosive shell". Its first use in English dates from the 1590s. It is likely derived from Old French pomegranate and influenced by Spanish granada, as the fragmenting bomb is reminiscent of the many-seeded fruit. Rudimentary incendiary grenades appeared in the Eastern Roman (Byzantine) Empire, not long after the reign of Leo III (717–741). Byzantine soldiers learned that Greek fire, a Byzantine invention of the previous century, could not only be thrown by flamethrowers at the enemy, but also in stone and ceramic jars. Later, glass containers were employed. The use of Greek fire spread to Muslim armies in the Near East, from where it reached China by the 10th century.