It was not only in Syria that this opportunity was afforded, for a parallel development of circumstances upon the plateau of Asia Minor seems to have encouraged the revival of the chief states also by the removal of their embarrassments. The Assyrian invasions had broken the strength of the Muski, who had for some time threatened to overwhelm and submerge the Hittite peoples; and now the gradual withdrawal of both enemies was marked by a cycle of Hittite works which proved how deep-rooted was their civilisation, and later history shows how radical must be the changes that would supplant it in their mountain homes. At Boghaz-Keui a new palace, unadorned, however, with sculptures, sprang up on the site of that of the Great Kings, which was now completely ruined. It is possible that the great walls of the citadel as they are now seen were the product also of this age.[924] They would seem to have been furnished, now or within a few generations, with the great arched gateways decorated with sculptures[925] which are one of their most striking features. Incidentally there is disclosed in the representation of a female warrior upon one of the great jambs[926] the development of, or union with, the Amazons,[927] whose fame lived in Greek history and tradition while the deeds of the old Hatti kings were already buried in oblivion. At Eyuk we have seen there is indication of a corresponding phase of local buildings, involving details of architecture and sculpture peculiarly Hittite. It would seem, however, that it was not in the old centre of administration that the dominant Hittite spirit most revealed itself. The sculptures of Bor[928] and Ivrîz,[929] and the related inscriptions of Bulghar-Madên[930] and Karaburna,[931] with others on the Kara Dagh and at Bogche, as well as numerous minor works, are all indications of a considerable area united as a single kingdom, the centre of which was Tyana. The Assyrian records of later times tell indeed of a powerful tribe or people named by them the Khilakku, whose geographical disposition seems to correspond with this area. These two facts in association recall the tradition of a great ‘Cilician’ empire, mentioned by Solinus,[932] which was said to have embraced within its sway most of the great states of Asia Minor and of Syria that had formerly acknowledged the rule or suzerainty of the Hatti kings.[933]