Elbeg Nigülesügchi Khan (1361–1399) was a Mongol Khan of the Northern Yuan dynasty based in Mongolia. Elbeg was the younger brother of Jorightu Khan and ruled for seven years. His reigning title Nigülesügchi Khagan means "Merciful Emperor" in Mongolian language. Border skirmishes with Ming China and the Oirat rebellion plagued his reign.

During his reign, the Oirats began to openly challenge the Borjigin family and the Ming repulsed Mongolian invasions. According to Tsagaan Sechen, Elbeg was charged with responsibility for all things wrong.

Whilst hunting game, Elbeg Khaghan saw a drop of hare blood on the snow and asked: "Is there a lady with a face white like snow and cheeks red like blood?” Khutkhai Taifu said: “My Khaghan! I know a lady of such beauty”. Khaghan asked him: “Who is that beauty?”. The Taifu spake: “Forbidden for thee to see her. If thou insistest, I shall tell thee”. And Khutkhai Taifu spake: “Princess Lady Öljeitü Huang, spouse of thy son Prince Kharauchog Duuren Temur Huang Taizi possesses such beauty.” Curious of the beauty of his son's wife, Elbeg Nigülesügchi Khaghan ordered Khutkhai Taifu of Oirad: “My Taifu who helps see the unseen, who helps reach the unreachable and who makes dreams come true. Find her now.”

Khutkhai Taifu visited the Princess and told her the Khaghan’s command: “The Khaghan wills to see thy radiating beauty.” The Lady was greatly angered: “Do the sky and earth come together? Should high noble Khaghans see their daughters-in-law? Is thy son Duuren Temur Huang Taizi dead? The Khaghan’s intention is evil.” The Khaghan didn’t listen to these words; he killed his son and took his daughter-in-law.

Later Khutkhai Taifu came to the Khaghan’s örgöö to drink yogurt. As the Khaghan was away, the Taifu sat to wait in front of the ger. Lady Öljeitü Huang Behichi said to him: “I shall send an envoy to the Khaghan, let us wait for him together. Come in to the southern örgöö.” As the Taifu entered the ger, Lady Öljeitü gave him a cup and says: “Thou raisedst me to a high noble rank. I was a Behichi, thou madest me a Taihu. I was a Princess, thou madest me a Queen.” From a bottle with one neck and two bowls, she poured arz for the Taifu and water for herself and made the Taifu fall drunk.

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