context: Clay vessels with lime or incendiary mixture, which have been used since the 9th century, were the prototype of hand grenades. As the ancient manuscript of Nijim-Edlin-Chassan Alram testifies, entitled "A Guide to the Art of Fighting on Horseback and of Various War Machines," the prototype of modern grenades, which was called "bortab," appeared among Arabs; it consisted of a glass ball filled with a composition of nitrate, sulfur and coal, equipped with a blank of stopin and suspended from a chain to a shaft [2].
question: Who invented the grenade?
answers.text: Arabs