Travelers from history and their famous sea voyages

Unecan of Polo
Here we see plainly that the Unc Chan of Rubruquis is the Unc Can or
Unecan of Polo. In the narrative of the former, Unc is only _connected_
with King or Prester John; in that of the latter, rehearsing the story as
heard some 20 or 25 years later, the two are _identified_. The shadowy
_rle_ of Prester John has passed from the Ruler of Kara Khitai to the
Chief of the Keraits. This transfer brings us to another history.