When it comes to world historical figures, whether they're Roman emperors, European kings, or American presidents, today most people know them for their larger-than-life deeds. People like Augustus, Napoleon, and Thomas Jefferson changed the world. They conquered vast amounts of territory, or they led successful revolutions that changed the governments of their countries - or both. But even the most legendary rulers were also capable of deep and lasting friendships. In fact, many of their closest friends also served key roles in their rise to power.