Yes, there was a book thats was made which is a prequel to Halo 1. It takes place 35 or 45 years before Halo 1. (i think 45) It tells how the master chief came to be, how the covenant war started, the master chiefs real name, and how the planet reach... And then Halo 1 is really like a sequel to Halo The Fall of Reach, then came Halo 2, and then how the fight ended, Halo 3. (which I beat!) And the headline is Finish The Fight. And now there making a Halo strategy/RPG game called Halo Wars. Coming out March 3rd, 2009! Which is a prequel to Halo 1, it takes place 20 years before. After Master Chiefs best friend dies in the book, they skip ahead 21 (I think) years later. And I'm guessing it tells what happened during those 21 years, even known Master Chief isn't in Halo Wars. Then in Fall 2009, a game called Halo 3:ODST is coming out. It is a prequel again! But it takes place during Halo 2! In Halo 2, there are 2 levels were your in Earth, and then you go to Halo. And Halo 3:ODST says what happened back on Earth. So there is some history of Halo. I hope you enjoyed it.