In the year 1162, at the end of spring, a sonorous cry rang out from the yurt of Yesugei, chief of the Mongol Kiyat clan – a male child who would change the fate of the Mongols was born. At that time the Kiyat clan had just defeated the rival Tatars and captured one of their martial heroes. To mark this victory, Yesugei named his newborn son after the Tatar warrior. It was the most prominent name in the 13th-century military history: Temujin Borjigin.