Developers of a video game called Kingdom Come: Deliverance speak of a pretty serious effort to pursue historical accuracy in their portrayal of Northern Bohemia as it was in 1403. In this game, a player takes the role of a son of a blacksmith who travels around in 16 square kilometre area between modern day Sasau and Rattay.
Real world settlements and towns in the game include Stříbrná Skalice, Světlá nad Sázavou, Ledečko, Sázava Monastery, Talmberk Castle, Samopše, Úžice, Nový Dvůr, and Přibyslavice.
Minorities portrayed in the game mostly consist of Cuman mercenaries. There are no black or oriental people travelling around the countryside. This makes a situation that keeps drawing significant and consistent amounts of critique in gaming press and as such, likely affects the score and sales of the game negatively. Is it called for? Should a person living in rural countryside of Bohemia in 1403 expect to encounter people of different and diverse skin colors? [Here] (http://www.eurogamer.net/articles/2018-02-20-kingdom-come-deliverance-review) is an Eurogamer's review of the game as an example.
Direct quote from the review by Eurogamer:
But there's also a big problem. There are no people of colour in the game beyond people from the Cuman tribe, a Turkic people from the Eurasian Steppe. The question is, should there be? The game's makers say they've done years of research and found no conclusive proof there should be, but a historian I spoke to, who specialises in the area, disagrees.
"We know of African kings in Constantinople on pilgrimage to Spain; we know of black Moors in Spain; we know of extensive travel of Jews from the courts of Cordoba and Damascus; we also know of black people in large cities in Germany," the historian, Sean Miller, tells me. Czech cities Olomouc and Prague were on the famous Silk Road which facilitated the trade of goods all over the world. If you plot a line between them, it runs directly through the area recreated in Kingdom Come. "You just can't know nobody got sick and stayed a longer time," he says. "What if a group of black Africans came through and stayed at an inn and someone got pregnant? Even one night is enough for a pregnancy."
Does this historian's portrayal appear accurate and relevant in terms of how a peasant or a son of a blacksmith was likely to experience Northern Bohemia of 1403?
This question has been asked several times recently, along with a few other questions you might be interested in concerning medieval Bohemia as depicted in the game -- its depiction of locks and its depiction of bathhouses as places of sexual commerce.
Responses to the lack of representation of characters of color in the game strike me as more of a response to the paucity of characters of color in historical or historically-inspired video games in general (barring nation-building games like CK2) rather than necessarily the realities of late 14th and early 15th century Bohemia. I'm sympathetic to this -- I'd like to see more diverse fiction, the history of people of color in Europe is interesting, and seeing "but it's based on the Middle Ages/Early Modern period!" as an excuse to make yet another setting as lily-white as possible gets old fast. The presence of people of color in video games is under a large amount of scrutiny as an "authenticity" thing both because it has become heavily politicized and because it's in some ways more conspicuous to your average gamer than other seemingly-misplaced concepts and objects that have seeped into the historical-and/or-fantasy genre, like the potato. There were lots of places in medieval Europe where you might find Moors and North Africans, Sephardic Jews, and sub-Saharan Africans of various extractions all hanging out -- not even necessarily passing through. But at the same time, distribution of individuals of non-European descent within Europe wasn't uniform or fixed -- so the presence of non-white people in one place doesn't necessarily mean those same people were present in another place two countries over, or a century earlier, or that we have documentary proof they stuck around and started families there. (Though the latter's certainly possible, even if only by accident, as in the historian you quoted's scenario with a one-night stand at an inn producing children.) There being delegations of Japanese samurai in 16th century Rome doesn't necessarily mean there were delegations of Japanese samurai in 16th century England, for instance. But this is a great reason for people who make fiction to make fiction showcasing those places of cultural crossover -- that stuff's cool, and it's as "authentically" medieval/authentically Renaissance as settings defined by their relative lack of cultural crossover are. Encounters between white Europeans and non-white people really did happen, and a lot of stuff has made it into video games not because it's exhaustively well-documented as a frequent occurrence but because it sounds really cool and seems possible, even if it was not historically likely or common.
This has come up here quite a bit recently. This thread may provide you with some information on the topic.