History of the world
Whether in prehistoric or historic times, people always needed to be near reliable sources of potable water. Settlements developed on river banks as early as 3000 BCE in Mesopotamia, on the banks of Egypt's Nile River, in the Indus River valley, and along China's rivers. As farming developed, grain agriculture became more sophisticated and prompted a division of labour to store food between growing seasons. Labour divisions led to the rise of a leisured upper class and the development of cities, which provided the foundation for civilization. The growing complexity of human societies necessitated systems of accounting and writing.
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.