I like to add more comments here. Let's visit Incident at Gaoping Tombs. I added 
Empress Dowager Guo (郭太后). If there is 郭太后 characters, it is very
helpful to someone like me, cause 郭太后 teaches that 郭 character is sounded
like guo in chinese. Also they are very hhelpful to distinguish Zhang Yi. There is
so many Zhang Yi. You surely know that there are so many Zhang's in china. How could
we distinguish them? There spelling!(  )