They lived in southern Zabaykalsky Krai and Mongolian Dornod Province. Though Khiyad Borjigids and Tayichiuds were closely related and shared a common ancestry to Bodonchar, at times they were arch-rivals for the rule of Khamag Mongol. Though Khabul Khan of Borjigin had 7 sons, he nominated Ambaghai, a son of Sengum Bilge from Tayichiud, as his successor. Thus, Ambaghai Khan become second khan of Khamag Mongol. The rule of the Mongols alternated between Borjigid and Tayichiud tribes, finally coming into the hands of Genghis Khan of Borjigid.
The Tayichiud were rivals of the Naimans and several other tribes. In the Secret History of the Mongols, they are portrayed as bitter enemies of Genghis Khan. As allies of Jamukha and the Khereids, they could defeat the latter bitterly.
Although the ruling Tayichiud clan was destroyed by Genghis, their descendants, who surrendered, achieved fame in parts of the Mongol Empire. Jebe (born Jurgaadai), who struck the final blow to the Jurchens during the Mongol conquest of the Jin dynasty in 1219 and defeated Kypchaks and their European allies at the battle of Kalka in 1223, was from Besud clan of Tayichiud. Baiju, the commander of the Tammachi in Persia, was also from the Besud clan of the Tayichud. Chilaun, one of Genghis Khan's four close companions, was from the Suldus, a sub-clan of the Tayichiud. His descendant Chupan reached the peak of his career during the reign of Ilkhan Abu Said and was given the title of chief commander of all Mongol Khanates by the court of the Yuan Dynasty in 1327. In the Chagatai Khanate, another aristocrat, Buyan Suldus, overthrew Qara'unas in Transoxiana in 1359 but was executed by Chagatai Khan Tughluq Temur in 1362.
- History of Mongolia, Volume II, 2003
- The Secret History of the Mongols
- The Fall of Amir Chupan and the Decline of the Ilkhanate, 1327-1337 By Charles Peter Melville
- Abu Bakr al-Ahri Tarikh-i Shaikh Uwais