Mandukhai Khatun (, ᠮᠠᠨᠳᠤᠬᠠᠢ ᠰᠡᠴᠡᠨ ᠬᠠᠲᠤᠨ), also known as Mandukhai Setsen Khatun (, , ) (c. 1449 – 1510) was a Khatun (queen) of the Northern Yuan. With her second husband Batmunkh Dayan Khan, she helped reunite the warring Mongols. Early life Mandukhai was the only daughter of Chororsbai-Tumur, chingsang (grand councillor) of the Ongud Mongols in eastern Mongolia. Her family were aristocrats. In 1464 at the age of sixteen, Mandukhai was married to Manduul Khan, who ruled the Northern Yuan from 1473 to 1479. Mandukhai began to take precedence over Yungen Qabar-tu, the khan's childless first wife. Most sources report that Manduul Khan had no children, although two names are sometimes mentioned as daughters of Mandukhai. Based on their ages, it is possible they were in fact relatives of Manduul Khan, rather than daughters, and may have been cared for by Mandukhai. In approximately 1478 or 1479, Manduul Khan died under uncertain circumstances. He had no clear heir, leaving several Mongol princes struggling to become the Khan. His senior wife, Yeke Qabar-tu, disappeared, her fate unknown. Mandukhai brought from hiding and adopted the seven-year-old orphan Batumunkh, son of the late Bayan Mongkhe Jonon, a direct descendant of Genghis Khan and part of the Altan Urug, who had also been killed by Esmel (Ismail). As Batumunkh was the last living descendant of Genghis Khan, Mandukhai had him proclaimed Dayan Khan, and she rejected the marriage offer by Unubold, a powerful noble. However, Unubold, himself a descendant of Hasar, younger brother of Genghis Khan, remained loyal to Mandukhai and the child Khan. Khatun of Northern Yuan With command over the Mongols, Mandukhai made war with the Oirats and defeated them. Her stunning victory over the Oirats brought back great reputation of the Borjigins and united Mongolia for the first time in more than one hundred years. According to the Yellow Chronicle of the Oirat, a history of the Oirats, Mandukhai imposed the following symbolic laws upon the Oirats in order to mark her dominance over them: Oirats could not wear helmets with crests more than two fingers long. They could not refer to their ger, or yurt, as an ordon, meaning palace They had to kneel in the presence of a khan The Yellow Chronicle also reports that the Oirats were prohibited to eat meat with knives after Mandukhai's conquest. Anthropologist Jack Weatherford considered such a prohibition unlikely to have been