Sumerian Civilization (jan 1, 4500 BC – jan 1, 1900 BC)
Description:
 The approximate duration of the Sumerian Civilization. Sumeria is generally referred to as the earliest Human Civilization being founded in the fertile crescent of Mesopotamia. 
Added to timeline:
Date:
jan 1, 4500 BC
jan 1, 1900 BC
 ~ 2601 years