Khuzestan was once inhabited by a people known as the Elamites, who spoke neither Indo-European languages (like the Medes and Persians of the Iranian plateau) nor Semitic languages (like the peoples of the Mesopotamian city-states). The Elamite language was not related to any Iranian languages, but may have been part of a larger group known as Elamo-Dravidian. Archaeologists and historians have documented various Elamite dynasties ranging from approximately 2700 BCE to 644 BCE. However, various early proto-Elamite ruins such as Sialk exist in central Iran. The boundaries of Elam shifted throughout history, but Elam usually included present-day Khuzestan and areas of the Iranian plateau now part of the Iranian province of Fars. Elamite kings sometimes ruled as far afield as Babylon; sometimes they were completely subjugated by the Babylonians and Assyrians, and vice versa, as was the case for numerous dynasties that ruled Iran.