Scholars have defined civilization using various criteria such as the use of writing, cities, a class-based society, agriculture, animal husbandry, public buildings, metallurgy, and monumental architecture. The term cradle of civilization has frequently been applied to a variety of cultures and areas, in particular the Ancient Near Eastern Chalcolithic (Ubaid period) and Fertile Crescent, Ancient India and Ancient China. It has also been applied to ancient Anatolia, the Levant and Iranian plateau, and used to refer to culture predecessors—such as Ancient Greece as the predecessor of Western civilization—even when such sites are not understood as an independent development of civilization, as well as within national rhetoric.
The concept "cradle of civilization" is the subject of much debate. The figurative use of cradle to mean "the place or region in which anything is nurtured or sheltered in its earlier stage" is traced by the Oxford English Dictionary to Spenser (1590). Charles Rollin's Ancient History (1734) has "Egypt that served at first as the cradle of the holy nation".
The phrase "cradle of civilization" plays a certain role in national mysticism. It has been used in Eastern as well as Western cultures, for instance, in Hindu nationalism (In Search of the Cradle of Civilization 1995) and Chinese nationalism (Chinese;— The Cradle of Civilization 2002). The terms also appear in esoteric pseudohistory, such as the Urantia Book, claiming the title for "the second Eden", or the pseudoarchaeology related to Megalithic Britain (Civilization One 2004, Ancient Britain: The Cradle of Civilization 1921).
The earliest signs of a process leading to sedentary culture can be seen in the Levant to as early as 12,000 BC, when the Natufian culture became sedentary; it evolved into an agricultural society by 10,000 BC. The importance of water to safeguard an abundant and stable food supply, due to favourable conditions for hunting, fishing and gathering resources including cereals, provided an initial wide spectrum economy that triggered the creation of permanent villages.
The earliest proto-urban settlements with several thousand inhabitants emerged in the Neolithic. The first cities to house several tens of thousands were Memphis and Uruk, by the 31st century BC (see Historical urban community sizes).