The Wormhole

"where am I?" [Year 1066 England ] "OK I get that now so why am I here?" [To prevent William from killing Harold] "why?" [It's the duty of the host to rewrite history] "fair enough who are you?" [Am the archaic system host] James an unemployed young died in the year 2020 and went back in time and found out he has bounded to a system which give him mission to rewrite history and in turn gives him the power of time. Will he change the course of history? What will happen to the world as we know it?