Sumer, also known as the early Mesopotamian civilisation, was a bronze age civilisation that was founded by the two rivers Tigris and Euphrates at around 3500 BCE. the capital of Sumer was believed to be Ur, it's empire fell after the Akkads took the empire down to a new dynasty of the Mesopotamian civilisation. even they are the part of the Cradle of the Civilisation which was the same thing as Egypt and China.