Khabul Khan (or Qabul Qan) was a Mongol Khan and grandfather to Yesugei, and thus great-grandfather to Genghis Khan^[1]. Qabul khan successfully repelled the invasions of Jin Dynasty. During a treaty, Qabul is reported to have pulled the beard of the Jin Emperor. Though Qabul khan had 7 sons, he nominated Ambaghai, a son of Sengun Bilge from Taichuud clan, as his successor^[2].

References

1. ↑ Mongolia :: The rise of Genghis Khan - Britannica Online Encyclopedia
2. ↑ Erich Haenisch, Die Geheime Geschichte der Mongolen, Leipzig 1948, p.7 (=section 52)