So... Who was Menocchio?

Roger Chartier, in his essay "Reading Matter and 'Popular' Reading," mentions more than once the name Menocchio, but he never explains who he was or why he was important. He was "discovered" by the Italian historian Carlo Ginzburg and became the subject of his influential book 
The Cheese and the Worms (English trans., 1980). Here is a link to a contemporary review of the book by Christopher Hill in the Times Literary Supplement: Menocchio