The Merry Wives of Windsor in 1597, after which controversy over the original naming of Falstaff (he was originally the historic Sir John Oldcastle, which presumably did not please Oldcastle's descendants) forced Shakespeare to rename the character. It appears that the joke in V,v,85–90 is that Oldcastle/Falstaff incriminates himself by calling out the first letter of his name, "O, O, O!," when his fingertips are singed with candles—which of course works for "Oldcastle" but not "Falstaff." There is also the "castle" reference in IV,v,6. 18 January 1602 was the date the play was entered into the Register of the Stationers Company. The first quarto was
Oldcastle Revolt dismissing the adoration of the cross and the practice of confession. Following his statements, Oldcastle was charged as a heretic and condemned to execution; Henry intervened once more, giving the inmate forty days to repent. Oldcastle seized the opportunity, escaping on 19 October with aid of a group of London Lollards led by William Parchmyner, and later going into hiding at latter's house in Smithfield. During November 1413, several Lollards were sent to the Tower of London, as Oldcastle began sending messages to followers of the sect throughout England. Wealthy Lollards raised funds to equip the conspirators and hire mercenaries.