Iacomo Andrea
Iacomo Andrea, also known as Giacomo Andrea de Ferrara, was an architect from Ferrara and the author on a commentary on Vitruvius. Very little is known about Andrea; his name did not appear on any buildings in Milan. Luca Pacioli wrote that Andrea was almost like a brother to Leonardo da Vinci. Andrea drew a prototypical "Vitruvian Man" which may have served as the basis for Da Vinci's drawing or just been born alongside as a collaborative effort. Andrea was very loyal to the Sforza family. After the occupation of Milan by the French, Andrea is said  to have plotted against the French. He was put on trial and sentenced to death. Archbishop Pallavicini attempted to plead for his innocence. Iacomo Andrea da Ferrara was publicly beheaded May 12, 1500. His body was quartered and placed on four different gates of the city. Leonardo da Vinci did not plot against the French, but instead went into their service.