Henry IV, Part I was a play written by William Shakespeare, the second part of a tetralogy that includes Richard II, Henry IV, Part II, and Henry V. The play contained the oft-quoted line "The better part of valor is discretion." In 2270, James T. Kirk referenced the play, explaining that "discretion is the better part of valor" when ordering a retreat from three Romulan vessels. (TAS: "The Practical Joker")