It is unclear exactly when horses were first ridden because early domestication did not create noticeable physical changes in the horse. However, there is strong circumstantial evidence that horse were ridden by people of the Botai culture during the Copper Age, circa 3600-3100 BCE.[1] The earliest evidence suggesting horses were ridden dates to about 3500 BCE, where evidence from horse skulls found at site in Kazakhstan indicated that they had worn some type of bit.