INSTRUMENT OF ABDICATION
I, Edward the Eighth of Great Britain, Ireland, and the British Dominions Beyond the Seas, King, Emperor of India, do hereby declare my irrevocable determination to renounce the Throne for myself and for My descendants, and My desire that effect should be given to this instrument of Abdication immediately.
Edward VIII
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Of course we all know that this is the famous abdication of Edward VIII so that he could be with Wallis Simpson. His broadcast was much more personal, I think. My favorite line:
But you must believe me when I tell you that I have found it impossible to carry the heavy burden of responsibility and to discharge my duties as King as I would wish to do without the help and support of the woman I love.
Read this and other historical letters of resignation here.