Hungary was a country in eastern Europe. Its capital city was Budapest. (AUDIO: The Labyrinth of Buda Castle)
Hungarian was spoken in Hungary. (AUDIO: No More Lies, The Labyrinth of Buda Castle)
The Doctor's TARDIS had a Hungarian bathroom. (PROSE: Chasing the Dawn)
History
Early history
Hungary was attacked by the Mongol Empire following their siege of Kiev in 1240. (PROSE: Bunker Soldiers)
In 1462, Matthias was the King of Hungary. (AUDIO: Son of the Dragon)
20th century
In World War I, Austria-Hungary fought with Germany against Great Britain and France. (TV: The War Games)
In 1956, Hungary was invaded by the Soviet Union. (AUDIO: 1963: The Assassination Games)
In 1980, the Fourth Doctor and Romana II visited Budapest. (AUDIO: The Labyrinth of Buda Castle)
In 1989, the Communist regime in Hungary was overthrown. (COMIC: The Broken Man)
21st century
In 2018, Ramón Salamander triggered volcanic eruptions in Hungary as part of his plan to take control of Earth. (TV: The Enemy of the World)
References
In the 1240, Isaac noted that only the states of Poland, Bohemia, Austria and Hungary lay beyond Kiev if the Mongols were to take the city. (PROSE: Bunker Soldiers)