Note 357 — Chapter XXI · Chingiz Khān

They had been converted to Christianity by the Nestorians at the beginning of the eleventh century. See very interesting note in d’Ohsson, op. cit. i. p. 48. This Toghrul received the title of Oang, or King, and called himself Oang-Khān. The similarity of this in sound to the name Johan, or Johannes (John), led to the fabulous personage so familiar in Marco Polo and other travellers, as Prester John. Cf. Yule’s Cathay and Marco Polo, passim.