Kalmyk Khanate
In 1620, the leaders of the Choros and Torghut Oirats, Kharkhul and Mergen Temene, attacked Ubasi Khong Tayiji, the first Altan Khan of the Khalkha. They were defeated and Kharkhul lost his wife and children to the enemy. An all out war between Ubasi and the Oirats lasted until 1623 when Ubasi was killed. In 1625, a conflict erupted between the Khoshut chief Chöükür and his uterine brother Baibaghas over inheritance issues. Baibaghas was killed in the fight. However, his younger brothers Güshi Khan and Köndölön Ubashi took up the fight and pursued Chöükür from the Ishim River to the Tobol River, attacking and killing his tribal followers in 1630. The infighting among the Oirats caused the Torghut chief Kho Orluk to migrate westwards until they came into conflict with the Nogai Horde, which they destroyed. The Torghuts founded the Kalmyk Khanate but still stayed in contact with the Oirats in the east. Every time a great assembly was called, they sent representatives to attend.