The various Assyrian Empires, which had been the dominant force in the Near East, Asia Minor, the Caucasus, North Africa, Arabian peninsula and East Mediterranean for much of the period from the first half of the 14th century BC, began to unravel after the death of Ashurbanipal in 627 BC, descending into a series of bitter internal civil wars which also spread to Babylonia. The Iranian Medes, Parthians, Persians and Sagartians, who had been largely subject to Assyria since their arrival in the region around 1000 BC, quietly took full advantage of the anarchy in Assyria, and in 616 BC freed themselves from Assyrian rule.