Yeah I dunno about "no black people at all" cause they somehow managed to end up even in the
most ridiculous of places like Japan. I'd expect a few odd ones out across even Eastern Europe somewhere but probably only in major cities and such. "No black people in Europe" is especially doubtful considering that Italy, Spain and Portugal are in Europe.
You'd expect? But what about some historical stuff?
You are talking about cichu - windones. Do you remember the negotiation between Charles I the great and them about theirs tribute to Franks? No? So you don't know they told him to showed the tribute into his arse. And then there were some gestures. Ouch these gestures. Shortly after, there were three columns entering from multiple directions into the country. Lets say he accomplished nothing, then he burned fields, moved out and imposed weapon embargo on czechs, which is probably longest lasting weapons embargo in history of Europe. In 150- 300 years czech learned how to make decent weapons and they kept theirs weapon industry, so things were not that bad. (in long term)
Next year, a military expedition from Italy arrived to finish what he started. Either its leader was smarter and used diplomacy first, or these burned fields made czechs more sober, thus they got these voles and silver as a tribute.
Years 860 to 1100 were spend by leader trying to kill corruption to be able to get taxes to actually be able to field army to be able to resist large Germans invasion. Like when these taxes disappeared in pockets of some people, and he didn't get even 1/5 of them to be at least able to field permanent well trained army... Also there was tribal unification into one kingdom under one ruler. Then one of leader forbade slavery, which killed 30 percent of income from slaves moved through territory. Obviously NO SLAVERY, meant NO SLAVES moved through territory, or being HARSHLY punished.
Aside of czech national pride and xenophobia that preserved them as a state for over 1400 years, as mentioned in previous two paragraphs, there were another compelling reasons.
Shortly before years this game talks about, there was year 1315. Which if you are from European ancestors, you probably know was first year of massive crop failure... There were also years 1316, and 1317. Which of course meant, foreigners and blacks would be OBVIOUS foreigners, went to baking oven first. It's not like czechs would allow starving a children of people who lived in czech highlands for 300 years for some foreigner.
A black is obvious father of a children in fully white population. To have someone who could get a woman into a trouble near would be obviously bad idea. Even when he's not rapist, there could be accidents.
People in middle Europe at these times, thought white skin without birthmarks is quite important, and will not want to have children with someone with obvious, for them, birth defect.
To these days there is saying that means, after work kill black skin person instead of salary. Being obvious foreigner in 1360 was BAD idea. (Note certain groups of people WERE protected, no matter of skin color. Later Gypsies abused it for easy spread in Europe.)
Peasant though devils have dark skin, thus anyone black skinned was prone to get fork into his stomach. They were able to understand after thoughtful explanation that dark skinned person is a member of a guard of a local duke. But, sensible person would keep him in castle and in protected area, and insist someone OBVIOUSLY from his guard would ALWAYS accompany him to avoid misunderstanding. Even then there would be commotions which would distract peasants from work, which would be bad idea.
Basically, even when they would allow a blacksmith son to be black... Which would be quite strange. Then the guard in the castle would see an obviously strange person running toward castle, he's new, nobody told him blacksmith son in nearby village is black. There were raiders who burned a village, it has to be one of them. Boom crossbow bolt into his chest. End of story.