The Madness of King George is a 1994 film directed by Nicholas Hytner and adapted by Alan Bennett from his own play, The Madness of George III. It tells the true story of George III of Great Britain's deteriorating mental health, and his equally declining relationship with his eldest son, the Prince of Wales, particularly focusing on the period around the Regency Crisis of 1788–89. Modern medicine has suggested that the King's symptoms were the result of acute intermittent porphyria, although this theory has more recently been vigorously challenged, most notably by a research project based at St George's, University of London, which concluded that George III did actually suffer from mental illness after all. Filming of the movie took place from 11 July to 9 September 1994.