The exact dates when Kunya-Urgench was founded remain uncertain, but archaeological finds at the Kyrkmolla Hill (one of the main fortresses at the site) reveal that the town already had a strong structure in the 5th and 4th centuries BC. Some of the earliest records show that Khwarezm was conquered by the Arabs in 712, and Kunya-Urgench was given the Arabic name "Gurgandj". The city rose to prominence between the 10th and 14th centuries as the Khwarezmian capital, and as an important trading centre, competing in fame and population with many other Central Asian cities, such as Bukhara. It had become highly prosperous due to its strategic location on the main trade routes from the south to the north, and the west to the east, vastly contributing to the development of science and culture in Central Asia.