Some context in Byron and Shelley.  Claire Claremont (Miss Juliana) as a survival from another world.  Things we don't know: narrator's name; content of the papers.  A little bit about things that don't exist at all: his assumed name, or (it would be better to say, though I didn't) the difference between his false and real name.  I didn't get nearly as far as I would have wanted to here.