you might want to do a search for similar threads.. i know i've answered heaps of stuff on this.
but yeh, the context is the who why where when how etc.. and in emma it's 19th century highbury. and then you think about the values in those time.. it depends on what you want to talk about. you could talk about the idea of noblesse oblige, the role of women, the hierarchy, the importance of land and blood etc.