The Lower City of Hattusha

The first occupations at Hattusha we know about date to the Chalcolithic period of the 6th millennium BC, and they consist of small hamlets scattered about the region. By the end of the third millennium BC, a town had been built at the site, in what archaeologists call the Lower City, and what its inhabitants called Hattush. In the mid-17th century BC, during the Old Hittite Kingdom period, Hattush was taken over by one of the first Hittite kings, Hattusili I (ruled about 1600-1570 BC), and renamed Hattusha. Some 300 years later, during the height of the Hittite Empire, Hattusili's descendant Hattusili III (ruled 1265-1235 BC) expanded the city of Hattusha, (probably) building the Great Temple (also called Temple I) dedicated to the Storm God of Hatti and the Sun Goddess of Arinna. Hatushili III also built the portion of Hattusha called the Upper City.

See the official Hattusha website for more information concerning the history of Hattusha.

Source:
Gregory McMahon. 2000. "The History of the Hittites." Pp. 59-75 in Across the Anatolian Plateau: Readings in the Archaeology of Ancient Turkey. Edited by David C. Hopkins. American School of Oriental Research, Boston.