What language was spoken in Bohemia?

Bohemia is a region that is now the main part present-day Czech Republic, and their language is Czech, which was called Bohemian until about the 19th century. Czech originally evolved first from Proto-Slavic (an old language reconstructed by linguists, since we have no records of it) which turned to Old Czech around the 13th century, then slowly developed into the Czech that is spoken today.