Human settlement at Erbil can be dated back to possibly 5000 BC, and it is one of the oldest continuously inhabited areas in the world. At the heart of the city is the ancient Citadel of Arbil. The earliest historical reference to the region dates to the Ur III dynasty of Sumer, when king Shulgi mentioned the city of Urbilum, the ancient Assyrian name of modern-day Arbil.
