Which is the oldest civilisation in the world?

This has long been a subject of much debate and to this day no one is absolutely sure which is the oldest civilisation. This is mostly because people cannot agree on the definition of the word civilisation. The most common definition of the word is ‘an advanced state of development in human society, marked by progress in the arts and sciences, the extensive use of writing, and complex political and social institutions’. Mesopotamia is considered as the most likely answer to the question, based on archaeological evidence and the above definition. It is believed that Mesopotamian history starts from the emergence of urban societies in Southern Iraq in the 4th millennium.