Sumer
Sumer () is the earliest known civilization in the historical region of southern Mesopotamia, modern-day southern Iraq, during the Chalcolithic and Early Bronze ages, and one of the first civilizations in the world along with Ancient Egypt and the Indus Valley. Living along the valleys of the Tigris and Euphrates, Sumerian farmers were able to grow an abundance of grain and other crops, the surplus of which enabled them to settle in one place. Prehistoric proto-writing dates back before 3000 BC. The earliest texts, from c. 3300 BC, come from the cities of Uruk and Jemdet Nasr; early cuneiform script emerged around 3000 BC.
Prehistoric sites in Serbia
The Neolithic Starčevo and Vinča cultures existed in or near Belgrade and dominated the Balkans (as well as parts of Central Europe and Asia Minor) about 8,500 years ago. Some scholars believe that the prehistoric Vinča signs represent one of the earliest known forms of Writing systems (dating to 6000–4000 BC).