There were a handful of individuals who made similar trips though - aside from the famous ones like Marco Polo and Ibn Battuta, there's also a few envoys sent on behalf of the Franco-Mongol alliance.[2]
Or the Spaniards who went to the court of Timur: “Timour Beg turned to the knights who had seated around him… and said, ‘Behold! here are the ambassadors sent by my son the king of Spain, who is the greatest king of the Franks, and lives at the end of the world.’” [3]
[1] https://www.npr.org/sections/thetwo-way/2016/09/28/495821834...
[2] https://en.wikipedia.org/wiki/Franco-Mongol_alliance
[3] https://resobscura.blogspot.com/2012/10/a-spaniard-in-samark...