The document summarizes the Norman conquest of England in 1066 and its aftermath. It describes who the Normans were, how William the Conqueror invaded and defeated the English army at the Battle of Hastings to become King of England. It then discusses how William established a feudal system, built castles, retained some Anglo-Saxon institutions like shires and sheriffs, and introduced Anglo-Norman, changing the language of England. The period saw civil unrest and wars with Europe and the establishment of a line of Norman kings of England.