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This question has been answered time and time again in the last few weeks:
https://www.reddit.com/r/AskHistorians/comments/7y3zas/in_kingdom_come_deliverance_set_in_1400s_bohemia/
https://www.reddit.com/r/AskHistorians/comments/7v1lil/people_are_getting_extremely_upset_because_there/
https://www.reddit.com/r/AskHistorians/comments/7y8rxt/how_diverse_was_bohemia_during_the_fifteenth/
https://www.reddit.com/r/AskHistorians/comments/4ipxz3/is_it_plausible_for_moors_or_other_blackskinned/
https://www.reddit.com/r/AskHistorians/comments/7yyl1m/newly_released_video_games_attempt_to_accurately/
https://www.reddit.com/r/AskHistorians/comments/7rkol0/the_video_game_kingdom_come_deliverance_recently/