He was the eldest son of Khayishan and a Mongol-Ikhires woman. Since the Khayishan administration was founded on the unstable balance between Khayishan, his younger brotherAyurbarwada and their mother Dagi of the Khunggirad clan, Khayishan appointed Ayurbarwada as Crown Prince on the condition that he would pass the status to Kuśala after succession. However, after Khayishan's death Ayurbarwada succeeded to the throne in 1311. In 1320, Dagi, Temüder and other members of the Khunggirad faction installed Ayurbarwada's son Shidebala as the new ruler instead of Kuśala, because his mother came from the Ikhires clan, not the Khunggirad clan. To ensure Shidebala's succession, Kuśala was rewarded with the title of king of Chou and relegated to Yunnan in 1316; but fled to Esen Bukha-ruled Chagatai Khanate in Central Asia, as a pro-Khayishan official advised, after a failed revolt in Shaanxi. When the Chagatayid Khan Esen bukha heard that Kuśala was living near his realm, he came to greet him. After that, Kusala was backed by the Chagatayid princes. While in exile in Central Asia, he married Mailaiti, a daughter of Temuder of the Qarluq.
Brief accession and sudden death
Although the rival faction was purged by Yesün Temür Khan when Shidibala Khan was assassinated, he remained in Central Asia. He extended his influence in his stronghold, which was located to the west of Altai Mountains. In 1328, when Yesün Temür Khan died, a civil war known as the War of the Two Capitals erupted between Shangdu-based Ragibagh and Dadu-based Tugh Temür. The former was a son of Yesün Temür and was backed up the former Yesün Temür administration led by Dawlat Shah, and the latter was Kuśala's younger brother who was supported by the former Khayishan faction led by the Qipchaq commander El Temür and the Merkit commander Bayan, a governor in Henan. This ended in the victory of Tugh Temür since he secured support from most of the princes, aristocrats and warlords in the south of the Gobi Desert. Tugh Temür summoned his brother to come to Dadu. At the same time, Kuśala, with support from the Chaghadayid leaders Eljigidey and Duwa Temür, entered Mongolia from the Tarbagatai region. He also got support from princes and generals of Mongolia, and with overwhelming military power in the background, put pressure on Tugh Temür, who had already ascended the throne. Kuśala enthroned himself on February 27, 1329, north of Karakorum. Tugh Temür abdicated on April 3 the same year, and a month later El Temür brought the imperial seal to Kuśala in Mongolia, announcing Dadu's intent to welcome him. Kuśala responded by making Tugh Temür his heir apparent on May 15. Kuśala had proceeded to appoint his own loyal followers to important posts in the Secretariat, the Bureau of Military Affairs, and the Censorate. Taking 1,800 men with him, Kuśala set out for Dadu. On August 26, he met with Tugh Temür in Ongghuchad, where Tugh Temur had built the city of Zhongdu. He suddenly died only 4 days after a banquet with Tugh Temür. The Yuan shi states that the luckless Kuśala Khan died of violence. It seems that Kuśala was poisoned by El Temür, who feared losing power to princes and officers of the Chagatai Khanate and Mongolia, who followed Kuśala. Tugh Temür was restored to the throne on September 8.
Family
Khutughtu Khan had two wives who were Mailaiti, a descendant of the famous Qarluq chief, Arslan, who submitted to Genghis Khan and Babusha of the Naiman. They gave birth to two Mongol emperors, including Toghon Temür, the last Mongolian emperor who ruled China.
