Customers can buy the 1979 movie "Caligula" on Amazon as of 2015. The movie was directed by Tinto Bass and it was written by Gore Vidal.
The controversial movie is R-rated and it is about the "mad" emperor of Rome. The movie discusses the bizarre life of the emperor, including his lust for his sister and his marriage to a well-known prostitute. The movie was released in theaters on October 2, 1997, but it was not released on DVD until 10 years later. The movie starred Helen Mirren, Peter O'Toole and Malcolm McDowell. It has a run time of 156 minutes.