The wealthiest and best-organised of the twelfth-century plateau khanates, centred on the Tuul River, with a Church-of-the-East Christian ruling house and a gold palace-tent court whose day guard and ba'atur corps Chinggis Khan later copied. Its khan Toghril, titled Ong Khan by the Jin in 1196, was Temujin's patron and then his rival.
Defeated by Temujin in 1203 after the Kereyid victory at Qalaqaljid Sands; Ong Khan fled and was killed by the Naiman, and the Kereyid people were distributed among the victorious Mongol units.
The standard reference entry on the Kereyid: territory, Christian ruling house, court organisation, and the fall to Temujin in 1203.
Allsen's chapter narrates the 1199-1203 campaigns that destroyed the Kereyid khanate step by step.