Photo: Unknown medieval artist illustrating Froissart's Chronicles · Commons · Public domain · Cropped & Resized
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John Ball was an English priest who took a prominent part in the Peasants' Revolt of 1381. Although he is often associated with John Wycliffe and the Lollard movement, Ball was actively preaching "articles contrary to the faith of the church" at least a decade before Wycliffe started attracting attention.
Image: Unknown medieval artist illustrating Froissart's Chronicles, Public domain · Text from Wikipedia, CC BY-SA 4.0