Börte [SEP] noble family
been one of the key events that started him on his path to becoming a conqueror. She gave birth to four sons and five daughters one who, along with their own descendants, were the key bloodline which further expanded the Mongol Empire.
Early life.
Few historical facts are known about her early life, but Mongolians have many legends about her. What little is known is generally from "The Secret History of the Mongols".
Börte was born around 1161 into the Olkhonud of Khongirad. This tribe was
Khan (later known as Wang Khan and Ong Khan). After Yesügei's death, Toghrul initially helped Temüjin in arranging his marriage to Börte and uniting the tribes, but later defected to Genghis' "anda" and rival, Jamukha. 
In 1171 Yesügei died when his son Temüjin was nine years old. The "Secret History of the Mongols" records that he was poisoned by Tatars while sharing a meal at a wedding on the way home after leaving his son Temüjin at home of Dai Setsen, a noble man