Kerait

The Kereit (Mongolian: Хэрэйд; Kazakh: Керейт) was the most dominant tribe of the five major tribal confederations (khanlig) in the Mongolian plateau during the 12th century. As allies of Genghis Khan, the Kerait were influential in the rise of the Mongol Empire. In the 11th century, they converted to Nestorian Christianity and were a key example of prominent Christians among the Mongols.