Just a page or two. It helps give me a sense of the time and place, and gives characters context. I did the same thing for two of my earlier series, Rex Libris and Warlord of Io.

 

The whole story starts just as it did in Paradise Lost. Satan, the original James Dean, asserts his independence from Father. He gets into some seriously delinquent shizz, corrupts a third of the other angels, and so pisses off the Big Guy he gets the lot of them thrown into another dimension. It's detention on a cosmic, eternal scale. They fall for nine days and nights into a burning lake of fire.

 

After that, things really get interesting. Because revolutions eat their children.