http://www.google.com/search?q=edgar+allan+poe&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA_en
Are you sure he was?
Why is Edgar Allan Poe insane?
2 answers
How lazy you are! You didn't even bother to read even one of the links in the above search engine results? If you had, you would have found what Bob Pursley has told you -- alcoholism factored more heavily in his life than madness.