For 650 years - from the end of Roman rule to the Battle of Hastings - the Anglo~Saxons controlled England; in religion, culture and administration their legacy is still with us today.
This is a favorite subject of mine and I just put this book here to kick off the list but it is a book on a past (and some say dead) culture. There are those who believe that the Normans started everything from eradicating other cultures (Anglo-saxon, Irish, Welsh) to being the first global power as they slowly started their journey to making England the mighty Superpower it became.