The khans of the Keraites were most probably incapable of reading the pompous epistles composed in their name by the Nestorian missionaries, who endowed them with the fabulous wonders of an Indian kingdom. Perhaps these Tartars (the Presbyter or Priest John) had submitted to the rites of baptism and ordination (Asseman, Bibliot Orient tom. iii. p. ii. p. 487- 503).