The Mongolian empire was more influential to the world than you would think.
Genghis Khan (birth name: Temujin) was supreme Khan of the Mongols Empire that soon swallowed the Chinese. As a child he was born into royalty as his father was chieftain However, that bloodline spilled and left a nasty stain in the floor after his father was poisoned. His mother and all his siblings were left to poverty. At the age of ten he was kidnapped by his own father's allies, but a sympathetic guard helped him escape into a nearby river.
In Mongolia at the time Genghis Khan was alive it was divided into many separate tribes. This resulted in tribal warfare and countless raids and even the use of slavery. He did though, marry the woman whom his father arranged him to be with at the age of 16. Even when she was kidnapped, he and another friend rescued her. Genghis had three more children with her.
When he took over the Mongols as Khan, he was determined to unite as one country. Once taking control over the Mongols, he spread his troops into China. After conquering the majority of China, the Mongols made their way west. Although Genghis Khan died before he saw his Empire grow completely, he handed off his succession to one of his sons.
There is a theory that the beginning of the plague grew in Southern China and it spread through to the Mongols. Since the Mongols were beginning to take over parts of the west, the disease swept through them into the west and even making it's way into England. Another interesting theory.
This is an amazing quote from Genghis's brother before he became Khan of the Mongols, "What use is there in my becoming a companion to you? On the contrary, sworn brother, in the black night I would haunt your dreams, in the bright day I would trouble your heart. I would be the louse in your collar, I would become the splinter in your door-panel...as there was room for only on sun in the sky, there was room only for one Mongol lord," (Jack Weatherford).
*Weatherford, Jack (2004). Genghis Khan: War of the Khans. New York: Random House, Inc. p. 63.