Clad in chain mail riders knights became the masters of the new world, the world of the Middle Ages. The V-VIII centuries in the vast expanses of Eurasia a new era, the era of knights and serfs. However, there was one country that took a hit earlier than other heavy cavalry, and whose history became the prototype of the future - this country was Iran. Therefore, in order to complete the history of the Ancient World, we have to tell the prologue of the Middle Ages. In the middle of the II century BC Hun wave hit lived in the central Asian tribes Saks and yuedzhey. The Huns had destructional new weapons, heavy bow made of bone and wood, and, departing from the terrible dangers yuedzhi moved to India and Saks - to Iran. After the first collision with the kindred tribes Parthian Parthian Saks entered the Union; they passed the Parthians Huns military equipment, heavy bow and scaly armor. In the 120 years of the BC in the Middle East were the first Knights'neranimye ', sits on a huge, dressed in armor,' niseyskih 'horses. These knights are not only hit enemies with arrows; they had four-meter long spear, with which they threw themselves on the enemy, keeping a horse without stirrups and saddles - should be, with the help of some now forgotten tools. New heavy cavalry of the Parthians secured victory in the long struggle with the power heirs of Alexander, the Seleucids; nomads captured Mesopotamia and reached the Euphrates.