Wikipedia
Kussara (Kushshar) was a kingdom of the Bronze Age in Anatolia. The kingdom, though apparently important at one time, is mostly remembered as the origin of the dynasty that would form the Old Hittite Kingdom. The Kussaran king Pithana, with his son Anitta, forerunners of the later Hittite kings, conquered Kanesh (Nesa) and its important trade centrum in roughly 1780 BC. The seat of the Kussaran dynasty was then moved to Kanesh, though Kussara appears to have retained ceremonial importance. Anitta took the title of 'Great King' when he defeated the polities of Zalpuwa and Hattum. Pithana and Anitta are the only two recorded kings of Kussara, and their exploits are known chiefly from the so-called 'Anitta Text,' one of the earliest inscriptions in the Hittite language yet discovered. A further king, Labarna I is accepted as a king of Kussara by most scholars. Hattusili I, recognized as one of the first Hittite kings, referred to himself as 'man of Kussara,' but moved his capital from there to Hattusa (from which he likely took his name). It is clear, however, that even after the capital was moved, Kussara retained some importance, as it was there that Hattusili would call a council on his own succession.
Kussara is occasionally mentioned in the clay tablets of the old Assyrian trade period of Anatolia (as Ku-ša-ra) and less often in the early Hittite Kingdom (as KUR URU Ku-uš-ša-ra). The borders of Kussara are unknown and the old city of Kussara has not been found, though several proposals for its placement have been advanced. For instance, Massimo Forlanini, an expert in the geography of ancient Anatolia, has stated that Kussara was probably situated southeast of Kanesh, but presumably north of Luhuzzadia/Lahu(wa)zzandiya, between Hurama and Tegarama (modern day Gürün), perhaps on a road which was crossing another road to the north in the direction of Samuha. Professor Trevor Bryce, meanwhile, says "[t]he city of Kussara probably lay to the south-east of the Kizil Irmak basin in the anti-Taurus region, on or near one of the main trade routes from Assyria and perhaps in the vicinity of modern Şar ( Comana Cappadocia)."
From Old Assyrian trade tablets we know that a palace and an Assyrian trade station, or Karum, existed in the city. The language or dialect of Kussara is neither found nor described in either the Assyrian or Hittite texts. The Kings of Kussara became the Kings of Kanesh in the Karum IB period of Kanesh. Hattusili I and Hattusili III mentioned the origins of the Kings of the land of Hatti as Hattusili I styled himself: "man of Kussara . . . Great King Tabarna, Hattusili the Great King, King of the land of Hatti." No other town or land was ever mentioned by a King of Hattusa as the origin of the Kings of Hattusa. Because the Kings of Kussara and their clan formed the base of the Old Kingdom of the Hittites, the Hittite language (known as 'Nesili' to its speakers after the city of Kanesh or Nesa) was the language of the ruling officials. It is assumed that the language of Kussara was Indo-European, because if it were not, many more non Indo-European elements would be expected in its apparent successor, Hittite. Craigh Melchert concludes in the chapter Prehistory of his book The Luwians (2003–17): "Hittite core vocabulary remains Indo-European". The Anitta Text records that when Pithana captured Kanesh, he did no harm to it, but made the inhabitants 'his mothers and fathers.' Some scholars have taken this unique statement to mean there were cultural and/or ethnic affinities between Kussara and Kanesh.
Because there is a great geographic difference between the basin of the upper stream of the Kızılırmak River, the centrum of the Upperland of Hittite Anatolia and the Anti-Taurus Mountains area of Kussara, one might expect a great number of differences in culture, languages, and dialects between these regions.