History of the Tartars
Historia Tartarum (c. 1246)
Tartars
Most of Ascelin’s journey is lost, but that which remains, recorded by Simon of Saint-Quentin, was kept alive by Vincent of Beauvais.
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 the Mongol royal family by betrothing Prester John’s granddaughter to Chinggis Khan.
For more on Simon’s text and journey, see Guzman.