History of the Tartars
Historia Tartarum (c. 1246)
In the portion of the narrative that survives (that which was transcribed by Vincent of
Beauvais), Ascelin reports that Prester John has integrated his family into that of the Mongol royal family by betrothing Prester John’s granddaughter to Chinggis Khan. Most of Ascelin’s journey is lost, but that which remains, recorded by Simon of Saint-Quentin, was kept alive by Vincent of Beauvais.