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
John Oldcastle convicted as a heretic. King Henry V was still anxious to find a way of escape for his old comrade, and granted a respite of forty days. Before that time had expired, Oldcastle escaped from the Tower by the help of one William Fisher, a parchmentmaker of Smithfield. Oldcastle now put himself at the head of a widespread Lollard conspiracy, which assumed a definite political character. The plan was to seize the King and his brothers during a Twelfth-night mumming at Eltham, and establish some sort of commonwealth. Oldcastle was to be Regent, the king, nobility and clergy placed under