Eljigidei

Eljigidei, also called Alchidai, was a Borjigin prince, the son of Hachiun, a full brother of Genghis Khan. Hachiun died young, so Eljigidei headed the family. In 1203 he warned Temüjin of an impending attack by Toghrul, the Kereit khan, and fought when the Kereit were destroyed. In the 1206 appanage grants he received his father's share as a left-wing prince.

Campaigning under Ögedei, he helped destroy the Jin field army at Sanfeng Mountain in 1232 and captured Puxian Wannu of Eastern Xia in 1233. In 1251 he helped enthrone Möngke as khan.