PART III 7 hittite downfall

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hittite downfall and Demise of the Empire
After this date, the power of the Hittites began to decline yet again, as the Assyrians had seized the opportunity to vanquish Mitanni and expand to the Euphrates while Muwatalli was preoccupied with the Egyptians. Assyria now posed equally as great a threat to Hittite trade routes as Egypt had ever been. His son, Urhi-Teshub, took the throne as Mursili III, but was quickly ousted by his uncle, Hattusili III after a brief civil war. In response to increasing Assyrian encroachments along the frontier, he concluded a peace and alliance with Rameses II, presenting his daughter's hand in marriage to the Pharoah.
The "Treaty of Kadesh", one of the oldest completely surviving treaties in history, fixed their mutual boundaries in Canaan, and was signed in the 21st year of Rameses (c. 1258 BC).
Hattusili's son, Tudhaliya IV, was the last strong Hittite king able to keep the Assyrians out of Syria and even temporarily annex the island of Cyprus. The very last king, Suppiluliuma II also managed to win some victories, including a naval battle against the Sea Peoples off the coast of Cyprus. But it was too late.
The Sea Peoples had already begun their push down the Mediterranean coastline, starting from the Aegean, and continuing all the way to Philistia -- taking Cilicia and Cyprus away from the Hittites en route and cutting off their coveted trade routes. This left the Hittite homelands vulnerable to attack from all directions, and Hattusa was burnt to the ground sometime around 1180 BC following a combined onslaught from Gasgas, Bryges and Luwians. The Hittite Empire thus vanished from the historical record.
By 1160 BC, the political situation in Asia Minor looked vastly different than it had only 25 years earlier. In that year, the Assyrians were dealing with the Mushku pressing into northernmost Mesopotamia from the Anatolian highlands, and the Gasga people, the Hittites' old enemies from the northern hill-country between Hatti and the Black Sea, seem to have joined them soon after. The Mushku or Mushki had apparently overrun Cappadocia from the West, with recently discovered epigraphic evidence confirming their origins as the Balkan "Bryges" tribe, forced out by the Macedonians.
A large and powerful state known as Tabal had occupied the region south of these. Their language appears to have been Luwian, related to Hittite, but usually written in hieroglyphics instead of cuneiform. Several lesser city-states extending from here to Northern Syria also used Luwian, although they are sometimes known as "neo-Hittite". Soon after these upheavals began, both hieroglyphs and cuneiform were rendered obsolete by a new innovation, the alphabet, that seems to have entered Anatolia simultaneously from the Aegean (with the Bryges, who changed their name to Phrygians), and from the Phoenicians and neighboring peoples in Syria.
Ironically, the language of the Lydians, spoken in the West of Asia Minor until the 1st century BC, was apparently a linguistic descendant of Hittite, and not Luwian. This and the fact that one of Lydia's kings known to the Greeks bore the Hittite royal name Myrsilis (Mursilis) may indicate that this state was the purest cultural and ethnic continuation of the former Hittites. The last trace of this language persisted until the 5th century AD, according to some Church Fathers, when it was known as the tiny dialect of Isaurian, spoken in only one or two villages. 

 Although the Hittites disappeared from most of Anatolia after c.1200 BC, there remained a number of so-called Neo-Hittite kingdoms in northern Syria. The most notable Neo-Hittite kingdoms were those at Carchemish and Milid (near the later Melitene). These Neo-Hittite Kingdoms were gradually conquered by the Assyrians, who conquered Carchemish during the reign of Sargon II in the late 8th century BC, and Milid several decades later