Richard III (play)

You may be looking for the titular monarch.

Richard III was a play by William Shakespeare which depicted a fictionalised and unflattering account of the rise to power and short reign of King Richard III of England.

The Fifth Doctor took Peri Brown and Erimem to what turned out to be a substandard performance of the play in 1597. Later while drinking with Shakespeare, the Doctor chastised him for not doing his research and presenting such a distorted account of the events of Richard's reign. Infuriated by the Doctor's insults and account of actual events which implicated the bloodline of his beloved Queen, Shakespeare snuck aboard the Doctor's TARDIS and travelled back to 1483 in an attempt to influence actual events to more closely resemble his play. (AUDIO: The Kingmaker)

The Sixth Doctor later paraphrased and then quoted, "My kingdom for a horse," from Act V, Scene IV of the play. (AUDIO: The Hollows of Time)