Neo-Babylonian Empire (626 BC–539 BC), a period of Mesopotamian history that is also known as the Chaldean Dynasty
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Adnan died after Nebuchadnezzar II returned to Babylon, after that his son Ma'ad moved away to the region of Central-Western Hijaz after the destruction of the Qedarite kingdom near Mesopotamia, and the remaining Qedarite Arabs there were displaced from their lands and forced to live in Al-Anbar province and the on the banks of the Euphratesriver under the rule of the Neo-Babylonian Empire.
The first four empires were, according to Vieira, in order: the Assyro-Caldeans, the Persians, the Greeks and the Romans.
An alliance with the Babylonians and the Scythians helped the Medes to capture Nineveh in 612 BCE which resulted in the collapse of the Neo-Assyrian Empire.