Ruritania

Ruritania was a European country which was ruled by King Rudolf circa the early 20th century.

Sherlock Holmes and John Watson visited Ruritania numerous times and aided King Rudolf. The Enemy turned Ruritania into a fictional location from The Prisoner of Zenda and it became a popular byword for fictional locations. (PROSE: The Book of the Enemy)

Sebastiene, the owner of Planet 1, had a fondness for 18th century European houses. He remodelled his home to resemble a romantic Ruritanian castle, albeit at a scale was impossible on Earth. (PROSE: The Doctor Trap)

The Second Doctor and Winston Churchill encountered the Count and Countess at a chateau in 1918. They were members of the Players who spoke in ambigous foreign accents and were suspected of "Ruritanian pomposity". (PROSE: Players)

Ace had seen black and white films about Ruritania. She thought the buttons and epaulettes on Kedin Ashar's uniform made him look like a Ruritanian nobleman. (PROSE: Independence Day)

Behind the scenes
The publisher's summary for Doctor Who and the Androids of Tara describes Tara as a planet where "the colourful pageantry of old Ruritania mingles with ultra-modern Android technology".