Many (1) of Uzbek Khan’s own men began to defect to him, coming to his court, where he honored them and lavished gifts upon them, until his power became firmly established and his troops multiplied (2). He then fought Uzbek Khan, defeated him, killed him, and took possession of his kingdom and dominion; the slain ruler’s manpower and equipment were added to his own. Genghis Khan’s stature grew, his fame spread far and wide, and all the Turkic tribes of the land of Tamghāj submitted to him, so that he could ride forth with nearly eight hundred thousand fighting men. The largest (3) of these tribes was his own clan, called Qiyān (4); next in closeness to him were two great and numerous tribes, Azān and Qanqūrān (5). He devoted three (6) months of every year to hunting, and the remainder to war and administration.
Al-Juwaynī says: He would arrange a vast encirclement, such that the distance between its two ends was [afterwards] three months’ journey; when it tightened, such an immense variety of animals was driven into it that their number could not be reckoned. War then erupted between him and King Jalal (7) al-Din Khwārazm-Shāh, lord of Khurasan, Iraq, Azerbaijan, and other provinces and dominions (8). Genghis Khan subdued him, broke his power, overran him, and plundered him, seizing all his territories with the help of his sons in the briefest span, as we have mentioned in the annals. Genghis Khan’s reign began in 599 AH; his battle with Khwārazm-Shāh took place around 616 AH; and Khwārazm-Shāh died in 617 AH, as noted above. Thereafter Genghis Khan possessed the realms without rival or resistance. He himself died in 624 AH; his body was placed in an iron coffin, bound with chains, and suspended between two mountains in that region.
As for his yasa (9), it is written in two volumes in a bold script and is carried on a camel held in great veneration among them. Some (10) have reported that he would climb a mountain, then descend, then ascend and descend repeatedly until he was exhausted and fell unconscious; he would order those with him to record whatever was uttered upon his tongue at that moment. If this account is true, it is evident that Satan was speaking through him when its rulings were dictated.
Al-Juwaynī also relates that one of their ascetics would climb the mountains in intense cold for worship and heard a voice saying to him, “We have—”