Arbil (Hewlêr in Roman-alphabet Kurdish) (also written Erbil, or Irbil) (Akkadian: Arba-ilu; Arabic: اربيل‎ Arbīl; Kurdish: هه‌ولیر‎ Hewlêr; Sumerian: Urbilum; Syriac-Aramaic: ܐܪܒܝܠ Arbaelo) is, with a population of approximately 1.3 million (2009), the fourth largest city in Iraq after Baghdad, Basra and Mosul.[2] It is located 80 kilometres (50 miles) east of Mosul, and is the capital of Iraqi Kurdistan.
Urban life at Arbil can be dated back to at least 6000 BC,[3][4] and it is one of the oldest continuously inhabited cities in the world.[3][4] At the heart of the city is the ancient Citadel of Arbil. The Hurrians were the first to establish Urbilum and expand their rule to the rest of northern Mesopotamia. The city has since been under the rule of many regional powers, including the Assyrians, the Babylonians, the Persians, the Arabs, and the Ottomans. Arbil's archaeological museum houses a large collection of pre-Islamic artefacts, and is a center for archaeological projects in the area.[5]

Reference: http://en.wikipedia.org/wiki/Irbil%2C_Iraq