Though we defer writing the story of the Hittites until we have seen what their own works can tell us, we find ourselves obliged to trace its outline[78] in order to decide at what point that story ends. The Hittites first appear in history about 2000 B.C., when it would appear that they were already powerful enough to overturn the first dynasty of Babylon and sack that city, and that they had settlements in southern Syria on the frontiers of Egypt. Certain Hittite tablets from Central Asia Minor are said to belong to the same age. Nothing is known, however, of the constitution of the Hittites in these early times; but it may be inferred that they subsequently retired from the south or were there submerged. It is not until the fifteenth century B.C. that the name of the Hittites definitely reappears, when successive expeditions of the Pharaohs encountered them in the north of Syria. Then in the fourteenth century their capital is found at Boghaz-Keui, in the ruins of which their archives of this period have been recently unearthed. These, supplemented by the Tell-el-Amarna letters, tell how the King of the ‘Hatti’—the local and at that time dominant element—became Great King of the Hittite confederated peoples and vassal states, whose chief towns included most of the sites identified with Hittite remains, like Hamath, Aleppo, Carchemish, Marash, Malatia, and many city-states as yet unidentified. This was the period of their greatest empire, and it is probable that the regions of Cilicia, Lycaonia, Phrygia, and even Lydia at this time acknowledged the suzerainty of the all-powerful soldier-king. For five or six generations of the Hatti rulers the position of the Hittites as a dominant power in Western Asia was recognised by the Pharaohs and the Kings of Babylon, both in their letters and treaties and by the exchange of ambassadors. During the great migrations of the twelfth century B.C., however, it would seem that the Hatti dynasty was overthrown and the Hittite empire dismembered. This may be inferred from the cessation of their own archives and from the appearance of the Muski, identified in later times with the Phrygians,[79] upon the north-west frontier of Assyria,[80] having thus fought their way across the heart of Asia Minor. These were repulsed,[81] but this incursion was contemporaneous with a shifting of the chief Hittite power to Carchemish, while Hamath on the Orontes and other southern centres come into increased prominence.