Frederick Rolfe, the self-styled (for a time) "Baron Corvo," lived from 1860 to 1913 and published a handful of unusual books that did not sell well but which found some fervid devotees. Aspects of his life and experiences frequently tower over his literary work. And over the years there have been three full-length biographies concentrating more on the man than on his writings--the first being A.J.A. Symons's The Quest for Corvo (1934), an "experiment in biography" (as its subtitle states) which is more a detective-story quest for information than a straightforward biography. This first biography was followed by Donald Weeks's Corvo: Saint or Madman? (1971) and Miriam J. Benkovitz's Frederick Rolfe: Baron Corvo (1977). Last year, Strange Attractor Press published Robert Scoble's Raven: The Turbulent World of Baron Corvo (2013), which is not a full biography but a collection of fifteen essays on various aspects of Corvo's life.
Basically this book is the history of a small elite literary fandom. I expect we'll see more books like this in the future.