It is difficult to date the oldest literature as much of the text has been lost either by accident, total disappearance or deliberately. However, from what historians found, the oldest written literature dates from around 2600 BCE. Enheduanna, a Sumerian priestess, is the oldest literary author. People believe that literature contains the best things that have been said ever. In addition to that, it opens a way to understand different worlds, languages, cultures and historical perceptions. Moreover, different genres of literature have different roles.