http://tvtropes.org/pmwiki/pmwiki.php/Fanfic/HarryPotterAndTheManOfUnknown

Oldest Harry Potter Fan Fic on FanFiction.Net, posted by Gypsy Silverleaf on September 4, 1999. May sort-of be the only pre-Azkaban fic in existence. The book hadn't come out yet in the United States and the American author was thus only vaguely aware of the storyline. This explains a lot.

The "man of unknown" is Professor Thomas Erwin, a teacher at another Wizarding School, who seems to hate Harry for no apparent reason. Erwin was a well-loved man until Voldemort's downfall, after which he turned into a grouch and forbid the name "Harry Potter" from being spoken in his presence. It turns out Erwin was James Potter's half-brother and that he's pissed because Harry got sent to live with the Dursleys instead of him. Realizing what a jerk he's become, Erwin threatens to kill Dumbledore if he tells Harry the truth. The Ministry tries to arrest Erwin for this, but he escapes and lives out the rest of his life as a hermit before dying in misery. The End.

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Not particularly good or bad, but certainly odd. Notable mainly for being the first fic written for Harry Potter, which now has the most fics on Fanfiction.net by a huge margin. You can read it here . See here to see a tongue-in-cheek version of the story acted out with the Potter Puppet Pals.

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