Napoleon

Sometime after the success of 2001: A Space Odyssey, Stanley Kubrick expressed interest in making a movie about Napoleon Bonaparte.

Plot
The film would talk about the life and legacy of Napoleon Bonaparte.

Production
Kubrick did a lot of research on Napoleon, including trying to watch every film about him and even requesting that some friends of his buy every book about Napoleon from his local bookstore. He often studied paintings of the battles he was involved in and enlisted the help of the Romanian army for the paper costume battle scenes.

Why It Was Cancelled

 * 1) The full cancellation reasons are unknown, but one reason it was cancelled was because Stanley Kubrick died in 1999.
 * 2) A similar film revolving around Napoleon, Waterloo, was released in 1970 and performed poorly at the box office.

Results

 * The Stanley Kubrick version was permanently cancelled.
 * In 2016, HBO announced producing a miniseries about Napoleon based on Stanley Kubrick's screenplay and had Cary Fukunaga at the helm as director.
 * Kubrick eventually used some of his Napoleon research in Barry Lyndon.