Since I recommended ONE book by Margaret George, I'll go further.

She also wrote these, which are excellent:
Mary, Queen of Scotland and the Isles
   and
Cleopatra

She also wrote Helen of Troy. It's pretty good, but not nearly as good as The Autobiography of Henry VIII, Mary, Queen of Scotland and the Isles, and Cleopatra.

The reason I say that is that those books are based on good historical bases, whereas almost nothing is actually known about Helen, (if she ever actually existed). Ms George, in Helen, builds the Greek gods in, who MUST be part of that story, although only as they appear to human senses and minds, which makes the mythological content easier to take.

Dave Oesterreich