Domenico da Cortona called "Boccador" was an Italian architect, a pupil of Giuliano da Sangallo. he was brought to France by Charles VIII and remained in the service of François I. His design for the royal Château de Chambord, represented in a wooden model, survived into the seventeenth century but responsibility for the design is also given to Leonardo da Vinci, who was at the royal court at Amboise at the same time, and the actual construction, during which much was improvised, was under the on-site supervision of Pierre Nepveu. Wikipedia