John Mowbray, 3rd Duke of Norfolk further been suggested that his comic catchphrase was deliberately intended to invoke Sir John Falstaff, one of Shakespeare's best known characters, for the audience. In Shakespeare's "Henry IV, Part 2", Justice Shallow refers to Falstaff as having once been a page to "Thomas Mowbray, Duke of Norfolk", Mowbray's grandfather. Falstaff is commonly considered to be a fictional representation of either Sir John Oldcastle or Sir John Fastolf—or possibly an amalgamation of the two—both of whom are variously associated with Mowbray. John Mowbray, 3rd Duke of Norfolk John Mowbray, 3rd Duke of Norfolk, KG, Earl Marshal (12 September 1415 – 6
John Oldcastle John Oldcastle, was Herefordshire's MP during the latter part of the reign of King Richard II. Oldcastle is first mentioned in two separate documents in 1400, first as a plaintiff in a suit regarding the advowson of Almeley church, and again as serving as a knight under Lord Grey of Codnor in a military expedition to Scotland. In the next few years Oldcastle held notable positions in the Welsh campaigns of King Henry IV of England against Owain Glyndŵr, including captaincy first over Builth Castle in Brecknockshire and then over Kidwelly. Oldcastle represented Herefordshire as a "knight of the shire"