Historians have many different views on Napoleon. Some historians say that he caused wars that killed many people in Europe, and therefore he was a bad ruler. Vincent Cronin disagrees with the view, saying that most of the Napoleonic Wars were started by Napoleon's enemies. Others argue that Napoleon made the mistake of trying to conquer too much land and that if he had stopped in 1808, his enemies might have left him alone. Other historians have said that he was a good ruler. They usually focus on the changes he brought to France and the countries he conquered. Andrew Roberts lists the greatest ideas that Napoleon brought to France and other countries as the Napoleonic code, freedom of religion, better civil services, better education, more equality, support for science and art and others.