The Nuttall Encyclopedia
An Irish adventurer, headed an insurrection in Kent, in 1450, in the reign of Henry VI.; encamped with his following on Blackheath; demanded of the king redress of grievances; was answered by an armed force, which he defeated; entered the city, could not prevent his followers from plundering; the citizens retaliating, he had to flee, but was overtaken and slain.
Wood, James, ed. Entry for 'Cade, Jack'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/c/cade-jack.html. Frederick Warne & Co Ltd. London. 1900.