This is however certain--in that the Yemenite Arabs, and especially those who tenanted the south of the peninsula, had, during the period now cursorily sketched, attained a very fair degree of civilisation--that arts and commerce flourished, that wealth was accumulated, literature cultivated, and talent held in esteem. On all these points we have not only the uncertain and distorted testimony of foreign authors, such as Strabo, Pliny, Diodorus, Ptolemy, and the like, but the more positive though fragmentary evidence afforded by the national writings, chiefly verse, that have survived to our day. In its general character and institutions the kingdom of Yemen seems to have borne a considerable resemblance to the neighbouring one of the Nile valley, on the other side of the Red Sea, and, like it, to have reached at a very early epoch a relatively high degree of prosperity and social culture, from which, however, it had long declined before its final extinction in the seventh century. But the daughter-kingdom of Hira had, as was natural, something of a Persian tinge; while that of Ghassan took a more Byzantine colouring. Lastly, the nomadic element predominated in the ill-cemented monarchy of Kindeh. But while the sceptre of Yemen was yet, in one form or other, outstretched over the length and breadth of the land, and its children, the genuine or African Arabs, formed a complete and dense circle of population all around, the centre of Arabia remained the stronghold of a different though kindred race, in their mode of living wild and ferocious; less susceptible of culture, but gifted with greater energy and concentration of purpose than their southern cousins. The latest recorded emigration of this branch of the Arab stock had been not from the south but the north; and instead of the mythical Kahtan, they claimed a no less mythical Adnan, or his supposed grandson Nezar, for their ancestor; their language, though radically identical with that spoken by the genuine Arabs, was yet dialectically different in several respects, and nearer to the Syriac or Hebrew. Lastly, unlike the Arabs from the south, they had little disposition for agriculture, and even less for architecture and the fine arts; their instincts leading them to a pastoral and consequently a nomadic life. The almost infinite ramifications of these “Mustareb” or “adscititious Arab” tribes lead ultimately up to five principal stocks. These were Rabiah, which, however, laid some claim to a Yemenite kinsmanship in the east centre of the peninsula; Koreish, on the west; Kais, or Kais-Ailan, and Hawazin, on the north; and Tamin in the middle. [Sidenote: [500-570 A.D.]]