What about the history of the necronomicon according to Lovecraft?

The Necronomicon was first mentioned in Lovecraft's 1924 short story "The Hound", written in 1922, though its purported author, the "Mad Arab" Abdul Alhazred, had been quoted a year earlier in Lovecraft's "The Nameless City". Inter alia, the work contains an account of the Old Ones, their history, and the means for summoning them.