Sebastiano Serlio was an Italian Mannerist architect, who was part of the Italian team building the Palace of Fontainebleau. Serlio helped canonize the classical orders of architecture in his influential treatise, "I sette libri dell'architettura" (aka "Tutte l'opere d'architettura et prospettiva"). Wikipedia
The definitive Wikipedia entry for Sebastiano Serlio. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Sebastiano_Serlio