Sir John Oldcastle of Martyrs". Oldcastle was also a minor character in the early Elizabethan history play the "Famous Victories of Henry V" (c. 1586?), which is generally thought to have been one of Shakespeare's sources for his plays on Henry IV and Henry V. The genesis of "Sir John Oldcastle" is crucially linked to the fact that when Shakespeare's "Henry IV" plays premiered on stage in 1597–98, the character Sir John Falstaff was called Sir John Oldcastle. This is indicated by abundant external and internal evidence. The change of names, from "Oldcastle" to "Falstaff," is mentioned in seventeenth-century works by Richard James
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.