Yesugen

Yesugen was one of the wives of Genghis Khan, the founder of the Mongol Empire. She was of Tatar ancestry. Her sister Yesui was also a wife of Genghis Khan. During his military campaign against the Tatars, Genghis Khan fell in love with Yesugen and took her in as a wife. She was, along with Yesui, the daughter of Yeke Cheren, a Tatar leader executed by the Mongol forces.

“Being loved by him, Yisügen Qatun said, ‘If it pleases the Qa’an, he will take care of me, regarding me as a human being and a person worth keeping. But my elder sister, who is called Yisüi, is superior to me: she is indeed fit for a ruler.’ ” -The Secret History of The Mongols