[3] After the fall of the Liao dynasty in 1125, the Khamag Mongols began to play an important role on the Mongolian plains.

The Taichiud (Cyrillic: Тайчууд) was one of the three core tribes in the Khamag Mongol Khanate of Mongolia during the 12th century and whose people lived in the southern part of Siberia's modern-day Zabaykalsky Krai.

The present-day Zabaykalsky Krai and the Khentii Province of Mongolia were the core regions of the Khamag Mongol Khanate.

However, Khabul's grandson Yesugei, who was a chief of the Khiyad tribe, was an effective and preeminent leader of Khamag Mongol.

Temujin, the future Genghis Khan, was born into Yesugei's family as the first son in Delüün Boldog on the upper reaches of the Onon river in 1162.