The Codex Trivulzianus is a manuscript by Leonardo da Vinci that originally contained 62 sheets, but today only 55 remain. It documents Leonardo's attempts to improve his modest literary education, through long lists of learned words copied from authoritative lexical and grammatical sources. The manuscript also contains studies of military and religious architecture.

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The Codex Trivulzianus is kept at Sforza Castle in Milan, Italy, but is not normally available to the public. In the main museum a room also contains frescos painted by Leonardo.

• List of works by Leonardo da Vinci

Wikimedia Commons has media related to Codex Trivulzianus.

• Institute Institute and Museum of the History of Science - Florence, Italy
• The Mind of Leonardo
• The Real Da Vinci Code
• The Official Castello Sforzesco Website
• Leonardo da Vinci: anatomical drawings from the Royal Library, Windsor Castle, exhibition catalog fully online as PDF from The Metropolitan Museum of Art, which contains material on Codex Trivulzianus (see index)

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