Historic heroes are what the game of Evony is about. Most historic heroes start off with better stats than regular heroes and they go to level 150 as opposed to just level 100 for ordinary heroes, which means they are much stronger than regular heroes. Their leadership is their most important aspect in terms of attack and defence. Higher leadership means more effective waves when attacking and a better defence bonus when defending. In most likely hood every one of the very strong heroes will be captured by the players who coin heavily at the very start of the server. Heroes like Genghis Khan will usually be the very first target of players because of their high attack and leadership. One of your best options if to target heroes with low attack but high leadership. In terms of defence these heroes can be a great asset and they can also help you to capture Historic cities very easily.