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.
Byblos
The site first appears to have been settled during the Pre-Pottery Neolithic B period, approximately 8800 to 7000 BC. Neolithic remains of some buildings can be observed at the site. According to the writer Philo of Byblos (quoting Sanchuniathon, and quoted in Eusebius), Byblos had the reputation of being the oldest city in the world, founded by Cronus. During the 3rd millennium BC, the first signs of a town can be observed, with the remains of well-built houses of uniform size. This was the period when the Canaanite civilization began to develop.