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( Niccolò Machiavelli, Baldassare Castiglione, Johannes Gutenberg ) was a Florentine diplomat and historian who wrote a book on how a leader should rule his/her country . ( Baldassare Castiglione, Johannes Gutenberg, Niccolò Machiavelli ) wrote a book on how a person should act in the Royal courts. ( Johannes Gutenberg, Niccolò Machiavelli, Baldassare Castiglione ) perfected the movable type printing (printing press).