Most historians agree that the first rockets were invented in China during the 1200s.
They used a chemical mix of sulphur, charcoal and potassium nitrate, which together are known as Black Powder, or more commonly, Gun Powder.
This kind of propellant is known as solid fuel as it is lit at one end and cannot be stopped until all the fuel is burned.
Rockets were used in warfare for the next 700 years, although they were never accurate.
Fireworks powered by solid rockets
(Annecy by Benoit Pichon)