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
John Oldcastle at last consented to a prosecution. Oldcastle refused to obey the archbishop's repeated citations, and it was only under a Royal Writ that he at last appeared before the ecclesiastical court on 23 September 1413. In a confession of his faith he declared his belief in the sacraments and the necessity of penance and true confession, but he would not assent to the orthodox doctrine of the sacrament as stated by the Bishops, nor admit the necessity of confession to a priest. He also said the veneration of images was "the great sin of idolatry". On 25 September he was