What is celltury?

What two emperors tried to restore the roman empire? How many people fought in all the crusades? What contributions did Cornelius Vanderbilt make to the railroad industry? Why did more railroads run east and west then north and south? What happened as a direct or indirect result of the crusades? What is a tanner in the middle ages? What were the crusades and why were they fought? How has roman religion impacted us today? What was a lasting effect on Europe as a result of the Crusades? Does the Gregorian calendar begins counting years with the founding of Rome? How many exits are there on an Airbus A380? What does every man is a piece of the continent mean? What were Europeans perspective on exploration? What development replaced wagon trails as the quickest way for the settelers to travel to the west after the civil war? When was dating invented? What tools were used by europeans settlers? What is the whole definition of Norse? Why was the roman empire so big? Advantages and disadvantages for Charlemagne and for Europe? How many years ago was 1001?