The Codex Leicester is a collection of largely scientific writings by Leonardo da Vinci. The Codex was purchased in 1980 by wealthy industrialist, art collector, and philanthropist Armand Hammer from the Leicester estate, and renamed the “Codex Hammer”. In 1994 Bill Gates bought it at auction for $30.8 million, making it the most expensive book ever, and renamed it the Codex Leicester.

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