He succeeded his father sometime around 1200. He married his own stepmother Gürbesu in a
levirate marriage. His elder brother was
Buyruq Khan. His horde was living around the shores of the
Black Irtysh. In 1200, he helped a brother of
Toghrul, a Kerait prince Jaqa Gambu (also known as Kereyidei), who fled to Tayang Khan. After a defeat in 1203 by
Genghis Khan, Toghrul escaped to Naiman territories. A Naiman patrol named Qori Sübeči did not recognize him and executed him on the spot. to march on Genghis together. However Alaqush informed Genghis beforehand of Tayang's march. The armies first met on 17 May 1204 in the
Khangai Mountains. Naiman patrols defeated a vanguard of Genghis' army. Genghis with a much lesser army, ordered all of his men to light five campfires per men around the tent. Naiman patrols investigated the large number of fires and informed Tayang. Tayang consulted his son
Kuchlug about the next step, advising a retreat and a guerrilla war. Kuchlug however spoke arrogantly, insulted Tayang and accused him of being a coward. An angered Tayang marched and crossed the
Orkhon river the next day, where he was joined by the forces of
Jamukha, Toktoqa (chief of
Merkids) and Quduqa (chief of
Oirats). Later they met Temujin's forces at the
Battle of the thirteen sides. However, he soon retreated again upon seeing
Jebe,
Subutai,
Khubilai and
Jelme. Seeing his hesitation, Jamukha left the Naimans. Later the Naimans with fewer numbers were ambushed at night by Genghis. Tayang himself was killed whilst attempting to escape. == Aftermath ==