Babylon ( BAB-il-on) was an ancient city located on the lower Euphrates river in southern Mesopotamia, within modern-day Hillah, Iraq, about 85 kilometres (53 miles) south of modern-day Baghdad. Babylon functioned as the main cultural and political centre of the Akkadian-speaking region of Babylonia. Its rulers established two important empires in antiquity, the 19th–16th century BC Old Babylonian Empire, and the 7th–6th century BC Neo-Babylonian Empire. Babylon was also used as a regional capital of other empires, such as the Achaemenid Empire. Babylon was one of the most important urban centres of the ancient Near East, until its decline during the Hellenistic period. Nearby ancient sites are Kish, Borsippa, Dilbat, and Kutha.
The earliest known mention of Babylon as a small town appears on a clay tablet from the reign of Shar-Kali-Sharri (2217–2193 BC), of the Akkadian Empire. Babylon was merely a religious and cultural centre at this point and was neither an independent state nor a large city. Instead, it was subject to the Akkadian Empire. After the collapse of the Akkadian Empire, the south Mesopotamian region was dominated by the Gutian Dynasty for a few decades, before the rise of the Third Dynasty of Ur, which encompassed the whole of Mesopotamia, including the town of Babylon.