Among the vast number of projects of Leonardo, there is a “mechanical knight” that has entered into the common imagination. In 1957 Carlo Pedretti was the first person to discover it, hidden amongst da Vinci’s countless designs. The mechanical knight was again mentioned in 1974, in the Codex Madrid edited by Ladislao Reti. Nevertheless, there was no attempt to reconstruct it until 1996. It was then that Mark Rosheim published an independent study of the robot, followed by a joint enterprise with the Florence Institute and Museum of the History of Science which mounted an exhibition with an entire section dedicated to Rosheim’s research on the subject. However, it was only in 2002 that Rosheim built a complete physical model for a BBC documentary. Since then, many exhibitions and museums of da Vinci’s models have included a soldier on wheels labeled, “Leonardo’s robot”.Studies on the subject mention that manuscripts relating to Leonardo’s idea for the robot are in the Codex Atlanticus, specifically folio 579r. Mario Taddei's further research has indicated folios 1077r, 1021r and 1021v as possible sources for the mechanisms of this mysterious humanoid robot.In the 2007 Mario Taddei made a new research on the original documents of Leonardo finding new pieces of in formations to build a new model of the soldier robot, correctly related to the drawings of Leonardo. This robot was designed just for defensive purpose, not for war or theater and his movement are related to the arms that move right and left with a rope.The Model is shown in exhibition around the world and the work of research is published in the "Leonardo da Vinci's robots" book.