In the letter addressed to the future George IV, Napoleon begs for the "hospitality of the British people" and calls on the prince regent as "the most powerful, the most constant, and the most generous of my enemies" for protection.
The letter is one of the centrepieces of an exhibition at Windsor Castle alongside a previously unseen letter from the Duke of Wellington, who defeated Napoleon at Waterloo that took place on June 18, 1815.
Items seized from the battlefield -- a lock of the emperor's hair and a star of a Knight Grand Cross of the Order of the Legion d'Honneur worn by Napoleon -- will also be on display along with other Napoleonic memorabilia, historic documents and contemporary prints and drawings.
In his elegant entreaty, Napoleon likens himself to Themistocles, a Greek statesman who threw himself on the mercy of the Persian ruler Artaxerxes and was subsequently received with honour.
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Nevertheless, he refused the request for protection, and Napoleon was exiled on St Helena where he remained until his death in 1821.
In the letter sent by Wellington to the prince 14 days after the battle, in which he led allied armies to victory, the duke flatters the prince.
The exhibition curator, Kate Heard, of the Royal Collection Trust, was quoted as saying: "It is very exciting to be able to display both these letters as part of the Waterloo and Windsor exhibition. These vivid and important documents provide a fascinating insight into the minds of the duke and emperor almost directly after the battle of Waterloo.