Bohemia

 was a European monarchy in at least the 17th and 19th centuries.

Geography
Bohemia was located in Central Europe, (AUDIO: Grand Theft Cosmos) and in central Bohemia were Castle Houska and Kokorin Forest. (COMIC: Herald of Madness)

History
In 1601, the Thirteenth Doctor, Graham O'Brien, Ryan Sinclair, and Yasmin Khan met Tycho Brahe and Johannes Kepler in Kokorin Forest. (COMIC: Herald of Madness)

In 1898, the Headhunter posed as Elizabeth of Bohemia in order to gain access to Drottningholm Palace. (AUDIO: Grand Theft Cosmos)