40th century BC

(40th century BC - 39th century BC - other centuries)

(5th millennium BC - 4th millennium BC - 3rd millennium BC)

Events

• Civilizations spring up within the Mesopotamia region.

Significant persons

Inventions, discoveries, introductions

See also: 40th century BC, 39th century BC, 3rd millennium BC, 4th millennium BC, 5th millennium BC, Centuries, Mesopotamia