Richard Alexander Fletcher was a historian who specialized in the medieval period. He was Professor of History at the University of York and one of the outstanding talents in English and Spanish medieval scholarship.
Having hiked the Camino from Le Puy to Santiago, and then from Porto north, I have long been curious about the cult of St. James. This long work does not disappoint. Fletcher is marvelous as an historian. Humble, he is even self-effacing at times, eager to admit his contraints and usually unwilling to speculate. He apologizes at one point writing, "This is necessarily, perhaps distastefully, speculative."
This is a nice and informative book on bishop Diego Gelmírez and medieval Galicia. Although some detail on Galicia was lacking (namely the evolution of the region as a space from Roman Gallaecia) and some informations are outdated by more recent scholarship, Richard Fletcher was very witty in his observations and this work is a valuable source on medieval Galicia (with quite some breakthroughs by the time it was written), besides being the only one available on Diego Gelmírez in English (if a work in the 1940's isn't counted).