Umma

Ancient city in Sumer, southern Mesopotamia, in what today is southeastern Iraq. Its location corresponds to modern Tell Jokha, 400 km southeast of modern Baghdad, midway between the rivers Tigris and Euphrates.
At Umma a calender system was developed, that would be the basis for the Babylonian calender.

History
It has not been determined when Umma was settled, it may well have happened in the 4th millennium BCE.
Around 2350 BCE: Umma reaches its strongest position, with King Lugalzagesi. During his reign, Umma comes to include Ur, Uruk and Akshak.

Modern times
2003 CE: With the US/British-Iraq War, Umma became unprotected to thieves. Much of Umma is believed to be destroyed or removed.