National Geographic Britains Nazi King: Was a member of the British royal family in cahoots with the Nazis? Recently declassified FBI files expose a surprising twist in the legacy of Edward VIII. In 1941, President Roosevelt had the Duke of Windsor investigated for suspicion of sympathizing with Nazi Germany. What the investigation found was an astonishing plot to put Edward VIII on Britains throne as Hitlers Nazi puppet. Under different circumstances, could this relationship have changed history as we know it?