More on Jockey of Norfolk from Infoplease:

• Jockey of Norfolk - Jockey of Norfolk Sir John Howard, a firm adherent of Richard III. On the night before the battle ...
• Dick - Dick That happened in the reign of Queen Dick—i.e. never; there never was a Queen Richard. ...
• William Shakespeare: Richard III, Act V, Scene III - Here pitch our tents, even here in Bosworth field. My Lord of Surrey, why look you so sad?
• Dictionary of Phrase and Fable: J - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "J"