Mesopotamian Civilization Before the Ancient Dark Ages

Sumer was an ancient civilization in southern Mesopotamia (modern Iraq) during the Chalcolithic and Early Bronze Ages. Although the historical records in the region do not go back much further than ca. 2900 BCE, modern historians believe that Sumer was first settled between ca. 4500 and 4000 BCE by people who may or may not have spoken the Sumerian language. These people, now called the "Ubaidians," were the first to drain the marshes for agriculture; develop trade; and establish industries including weaving, leatherwork, metalwork, masonry, and pottery