—“It is generally assumed that the Hittites came into Anatolia sometime before 2000 BC. While their earlier location is disputed, scholars speculate that the Yamnaya culture of the Pontic–Caspian steppe, in present-day Ukraine, around the Sea of Azov, spoke an early Indo-European language during the third and fourth millennia BC.
The arrival of the Hittites in Anatolia in the Bronze Age was one of a superstrate (aristocracy) imposing itself on a native culture (in this case over the pre-existing Hattians and Hurrians), either by means of conquest or by gradual assimilation. In archaeological terms, relationships of the Hittites to the Ezero culture of the Balkans and Maykop culture of the Caucasus have been considered within the migration framework. The Indo-European element at least establishes Hittite culture as intrusive to Anatolia in scholarly mainstream.
According to Anthony, steppe herders, archaic Proto-Indo-European speakers, spread into the lower Danube valley about 4200–4000 BC, either causing or taking advantage of the collapse of Old Europe. Their languages “probably included archaic Proto-Indo-European dialects of the kind partly preserved later in Anatolian.” Their descendants later moved into Anatolia at an unknown time but maybe as early as 3000 BC.[27]
According to J. P. Mallory it is likely that the Anatolians reached the Near East from the north either via the Balkans or the Caucasus in the 3rd millennium BC.[28] According to Parpola, the appearance of Indo-European speakers from Europe into Anatolia, and the appearance of Hittite, is related to later migrations of Proto-Indo-European speakers from the Yamnaya culture into the Danube Valley at c. 2800 BC,[29][30] which is in line with the “customary” assumption that the Anatolian Indo-European language was introduced into Anatolia sometime in the third millennium BC.[31]
Their movement into the region may have set off a Near East mass migration sometime around 1900 BC.[citation needed] The dominant indigenous inhabitants in central Anatolia at the time were Hurrians and Hattians who spoke non-Indo-European languages. Some have argued that Hattic was a Northwest Caucasian language, but its affiliation remains uncertain, whilst the Hurrian language was a near-isolate (i.e. it was one of only two or three languages in the Hurro-Urartian family). There were also Assyrian colonies in the region during the Old Assyrian Empire (2025–1750 BC); it was from the Assyrian speakers of Upper Mesopotamia that the Hittites adopted the cuneiform script. It took some time before the Hittites established themselves following the collapse of the Old Assyrian Empire in the mid-18th century BC, as is clear from some of the texts included here. For several centuries there were separate Hittite groups, usually centered on various cities. But then strong rulers with their center in Hattusa (modern Bo?azkale) succeeded in bringing these together and conquering large parts of central Anatolia to establish the Hittite kingdom.[32]”—