William Butler Yeats has cast his long shadow over the history of both modern poetry and modern Ireland for so long that his preeminence is taken for granted. Now, in the first authorized biography of Yeats to appear in over fifty years, leading Irish historian R.F. Foster travels beyond Yeats's towering image as arguably the century's greatest poet to restore a real sense of Yeats's extraordinary life as Yeats himself experienced it--what he saw,...