from Wikipedia Baghdad:
Baghdad (Arabic: بغداد Baġdād) is the capital of Iraq and of Baghdad Governorate, which it is coterminous with. With a municipal population estimated at 7,000,000, it is the largest city in Iraq. It is the second-largest city in the Arab World (after Cairo) and the second-largest city in southwest Asia (after Tehran).
Located on the Tigris River, the city dates back to at least the 8th century, and probably to pre-Islamic times. Once the center of Dar al-salam, the Muslim world, Baghdad has been a center of violent conflict since 2003 because of the ongoing Iraq War.