One of the most important discoveries at the site has been the cuneiform royal archives of clay tablets, consisting of official correspondence and contracts, as well as legal codes, procedures for cult ceremony, oracular prophecies and literature of the ancient Near East.
Although the 30,000 or so clay tablets recovered from Hattusa form the main corpus of Hittite literature, archives have since appeared at other centers in Anatolia, such as Tabigga (Maşat Höyük) and Sapinuwa (Ortaköy).