I hope everyone knows that Itachi isn't a bad guy! He was forced by Danzo and the elders to kill his family because the Uchiha clan and the Senju clan had a war over who was more powerful. And the Uchiha were going to take over Konoha Madara and the First Hokage fought at the river place Sasuke and Naruto did. Madara is the 3rd Uchiha who has the Sharingan. He discovered you can have Enternal Makgekyo (or whatecer) by taking you siblings eyes. Itachi wanted to die at Sasuke's hand. He was very sick and took many medications just to wait till Sasuke killed him. Since Itachi was so powerful that is why he was choosen to kill his clan. His father made him join the Anbu Black Ops to be a spy for their family while the 3rd made him be a spy for his family so the 3rd would know the attacks. Itachi was supposed to kill Itachi but Itachi loved Sasuke so much that he couldn't so he tols Sasuke to hate him and run and cling to life and stuff. Itachi had wanted to die at Sasuke's hand because in the villagers eyes Sasuke would be a hero, but in reality Itachi is the real hero. that isn't all of it but it's some.. sorry if this is a bit mixed up ^.^'