Though we have no clear allusion to the kingdoms in the Taurus regions at this time, we may infer that the two great Hittite states of Arzawa[744] and Khali-rabbat,[745] which lay on either side of his pathway, were already allied with him in one or other of these ways, before he descended to the north of Syria, and ventured to enter the political arena of western Asia, where the older powers were stationed to resist his oncoming. The whole of Syria as far northward as Aleppo had indeed for something like a century been within the sphere of influence of the Pharaohs. It is claimed for the Egyptian monarch Thothmes I. that before the close of the sixteenth century B.C. he had set up the boundary of his empire somewhere near Carchemish on the Euphrates, in the ‘land of Naharain.’ Three of his successors by occasional expeditions, beginning with that of Thothmes III. about 1469 B.C.,[746] had sought to retain this boundary, and had come into conflict with the Hittite tribes already settled in these regions. These seem to have submitted like other northern states, nominally at any rate, to the Egyptian supremacy, and to have regularly sent their tribute to the Pharaoh. But though Amenhetep III. inherited the full power and dominion of his predecessors, he seems to have found it necessary to send an expedition at the beginning of his reign to maintain his suzerainty. These frontier states indeed occupied at this time a position of considerable difficulty, where all the diplomacy of their chieftains was required to maintain the security of their inheritance. The reins held by the Pharaoh on his distant throne at Thebes may, it is true, have been only lightly felt: an occasional present or diplomatic letter to the court would generally secure respite from that direction; but their anxieties were not thereby ended, for in the East a nearer power claimed their allegiance also, before the arrival of the Hatti leader added to their perplexities. This power was the kingdom of Mitanni, which was firmly established in northern Mesopotamia, from the Euphrates to the Tigris. Tushratta, who now occupied the throne, represented the fourth generation of his illustrious house,[747] the authority of which had been strengthened through the foresight of his predecessors by intermarriage with the royal family of Thebes. His father’s sister had been wife of Thothmes IV., and his own sister was married to the ruling Pharaoh. He clearly realised that the continued support of Egypt would be necessary to him if he was to save his kingdom from being crushed by the increasing pressure of Assyria on the one hand and of the Hittite on the other; so that with some alacrity on his part[748] his daughter was sent to Egypt to become the wife of the heir-apparent. Propped up in this manner, the Mitannians had not only established a formidable barrier at the Euphrates against Hittite expansion eastward, but had even extended