He grew into legend, this exultant young giant whom historians call Prester John, the blond, gray-eyed Christian knight, swordsman of fabled prowess, who roused the nomadic hordes of the waste country in a great crusade to capture the Holy Land.Prester John's bloody quest for power in the name of God ranks with those of Marco Polo and Genghis Khan.Gardner F. Fox, historian extraordinary, now identifies the fabulous Prester John as Sir John of Lincoln,...