No commodity nor animal in the natural world has served man so well and so much as the horse. By virtue of their dexterity and sociability, horses formed the economic and military lynchpins of many empires. Although many nations understood the significance of having an ample supply of horses, the best horses were often thought to come from Spain and Asia.
Nomadic tribes on horseback were feared for the deadly speed and flexibility their warriors had. Horses also had a vital non-belligerent role as well: the Persians (formerly a nomadic tribe themselves) used of horses in the chaparkhaneh, a courier system which can be considered the world's first postal service.