John Twyn was a small printer in Cloth Fair, and his crime was that of printing a pamphlet entitled _A Treatise of the Execution of Justice_, in which, as it was alleged, there were several passages aimed at the King's life and the overthrow of the Government. It was further stated by the prosecution that the pamphlet was part of a plot for a general rebellion that was to have taken effect on the 12th October 1662. The chief witnesses against Twyn were Joseph Walker, his apprentice, Sir Roger L'Estrange, and Thomas Mabb, a printer. Their evidence went to show that Twyn had two presses; that he composed part of the book, printed some of the sheets, and corrected the proofs, the work being done secretly at night-time. On entering the premises it was found that the forme of type had been broken up, only one corner of it remaining standing, and that the printed sheets had been hurriedly thrown down some stairs. In defence Twyn declared that he had received the copy from Widow Calvert's maid, and had received 40s. on account, with more to follow on completion, and he stoutly asserted that he did not know the nature of the work. The jury, amongst whom were Richard Royston and Simon Waterson, booksellers, and James Fletcher and Thomas Roycroft, printers, returned a verdict of Guilty, and Twyn was condemned to death and executed at Tyburn. The charge against Simon Dover was of printing the pamphlet entitled _The Speeches of some of the late King's Justices_, which we have already seen that Roger L'Estrange had seized in John Hayes' premises, while Thomas Brewster was accused of causing this and another pamphlet, entitled _The Phœnix of the Solemn League and Covenant_, to be printed. In defence, Thomas Brewster declared that booksellers did not read the books they sold; so long as they could earn a penny they were satisfied--an argument that had been used more than a century before by old Robert Copland as an excuse for indifferent printing. Both Dover and Brewster were condemned to pay a fine of 100 marks, to stand in the pillory, and to remain prisoners during the King's pleasure. Sir Roger L'Estrange, as a reward for his services, was appointed Surveyor of the Press, with permission to publish a news-sheet of his own, and liberty to harass the printers as much as possible.