English executioner notorious for his barbarous inefficiency; for nearly two centuries after his death his nickname was popularly applied to all of England's executioners.

Ketch is believed to have received his appointment as public hangman in 1663. The first recorded mention of him appears in an anti-Roman Catholic broadside published in 1678 entitled The Plotters Ballad; Being Jack Ketch's Incomparable Receipt for the Cure of Traytorous Recusants; or Wholsesome Physick for a Popish Contagion. He is reported to have executed Lord William Russell (1683) in a brutal and inept manner, and in 1685 he took at least eight strokes of the axe in beheading James Scott, duke of Monmouth.