How many years between 1996 to 2014?

How did Charlemagne keep control over the territories that he conquered? How does the setting lead to the theme of Romulus and Remus? Who invented the robe? Who owned fishbourne roman palace? How did the Protestant churches begin? What is the meaning to Norman Cousins quote ''history is a vast early warning system''? Who reined during the great fire of Rome? What happened during the crusades? Where did west African salve traders get their slaves to sell to Europeans? What did the Europeans believe in? Where did the name Frank originate? What does the name 'Clyde' mean? Describe the structure of the roman army? How long have the alps been around? Who was the leader of the early republic? Who led the first crusades? How did the crusades contribute to the decline of feudalism? Where did the phrase holy cow come from? Something worn over the face? How did the creation of a professional army change Roman politics?