The Emperor's New Clothes (2001)

A nice conceit here, but rather leisurely pursued.  When Napoleon is in exile, his attending couriers locate a "ringer" to take his place while he escapes in an attempt to regain his empire.  The doltish sailor and the imperious leader are both played by Ian Holm who appears to be enjoying himself hugely.  However things do not go to plan: the returned Napoleon can not locate any one to help him, while his replacement grows to enjoy his new-found luxury.  When the latter dies, everyone assumes that Napoleon is gone, but the real one is not having this.  However his attempts to persuade them just lead others, including the wife he has taken, to assume that he is mad (like all the other Napoleons crowding the mental hospitals).  The doctor who knows the truth was a love rival, so he won't help out of spite. Napoleon accepts his fate and lives to a ripe old age in domestic bliss.  I don't feel that I have spoiled this movie by outlining the plot, since it is clear from early on that it can only go one way.  But all in all, pleasant viewing.