Jurgen was written 1919 and was banned in both Boston and New York and I suspect this help seal the the book. . Cabell was a pessimist , but a very funny one. His particular humor is Irony and he's very good at that. he wrote 50 fantsy novels in all 17 of which are set in the local of Jurgen which the imaginary mediaeval French province of Poicesteme of which im not sure of either the pronunciation or the spelling of that pace . Cabell's popularity faded in the 1930's and he'd died in 1958.The Harold Shea series was
The Incomplete Enchanter (1941),
The Castle of Iron (1950)
Wall of Serpents (1960)
Castle of Iron and Wall of Serpents don't have quite the same magic as Incomplete Enchanter.
I do know of Cabell's work just never got around to reading it.
His most famous quote " The optimist proclaims that we live in the best of all possible worlds and the pessimist fears that this is true "