The only conqueror whose career suits in time and approximates in circumstances is the founder of Kara-Khitai, which existed as a great empire in Central Asia during the latter two-thirds of the 13th century.
This personage was a prince of the Khitai or Khitaian dynasty of Liao, which had reigned over northern China and the regions beyond the Wall during a great part of the 10th and 11th centuries, and from which came the name Khitai (Cathay), by which China was once known in Europe and still is known in Russia.
He took the title of Gur Khan or Kor Khan, said to mean "universal" or "supreme" khan, and fixed at Balasaghurl, north of the T'ian Shan range, the capital of his empire, which became known as that of Kara-Khitai (Black Cathay).
Fn3 The stories of Khitai as a Christian empire, which led the Jesuits at the court of Akbar to despatch Benedict Goes in search of it (1601), did, however, suggest to Jerome Xavier, their chief, that the country in question "was the Cathay of Marco Polo, and its Christian king the representative of the famous Prester John" - a jumble of inaccuracy.
The Uighurs, and in the 12th century the Kara-Khitai, took possession of it in turn.
Kara Khitai Empire in the early part of the 13th century (the legendary Prester John) was a member of a Christian tribe called Naiman, which is one of the four chief tribal divisions mentioned by Ney Elias.