I, Claudius

I, Claudius was a novel that the Tenth Doctor noted made Caligula look worse than he really was. (WC: The Lonely Computer)

Behind the scenes
The novel has been adapted several times.
 * Derek Jacobi played the role of Claudius in the and Augustus in the.
 * David Warner played Claudius in the 1972 stage adaptation.
 * Brian Blessed played Augustus in the 1976 serial.
 * Neil Gaiman played on the name with the title of his short story "I, Cthulhu".