The chariot is thought to first have been invented around 2000 B.C. in Mesopotamia. The Egyptians built upon the original design for the chariot and improved it by making it lighter, changing the location of the chariot's axle so that the driver would stand closer to it and casing parts of the axle with metal in order to decrease the resistance between it and the wooden wheel hub. The Egyptians had two types of chariots, the war-chariot and the carriage chariot. The difference between the two was situated in the wheels; war-chariots had six spokes in the wheels, while carriage chariots only had four.