A warrant was issued for his arrest in May 1696, on an information that, under the name of John Chaplin, he had printed a paper, on the Jacobite assassination plot of George Barclay and others, called An Account of a most horrid Conspiracy against the Life of his most sacred Majesty, with intent to give notice to the people mentioned in it to fly from justice.
Residing at the court of the Stuarts in France, or conspiring in England, Charnock and Sir George Barclay appear to have arranged the details of the unsuccessful attempt to kill William III near Turnham Green in February 1696.
After the death of Queen Mary in 1695 Parkyns associated with Sir George Barclay, Robert Charnock, Captain George Porter, "Scum" Goodman, and others, in their plan to kidnap or to assassinate William.
These men had been found guilty of high treason in conspiring to assassinate William III.
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