Review of “Haïta, the Shepherd” (1891)
Ambrose Bierce (writer).
Read in 2019.
This allegorical fantasy is the source of the name “Hastur”. Though bleak, its actual influence on Robert W. Chambers seems small, and its influence on Cthulhu Mythos writers starting with H. P. Lovecraft is effectively nil.
References here: Yellow Sign.