On 14 October 1066, Norman invaders led by Duke William of Normandy won a decisive victory over the Anglo-Saxon King Harold Godwinson. But why did William have a claim on the English throne? How did the Battle of Hastings unfold? And how did William the Conqueror change England forever? To answer the big questions about this decisive battle, Rob Weinberg talks to Professor Virginia Davis, of Queen Mary University of London.