We have hitherto completely ignored the seats of higher civilisation which were to be found in ancient times in the peninsula of Arabia. As early as the second millennium B.C. southwest Arabia, the Yemen, the country of the Sabæans and Himyars, which was well adapted for agriculture on account of the regular rains of its tropical summer, had developed a civilisation which has left, in the ruins of huge buildings and numerous inscriptions, monuments which still excite our admiration. The Greeks and Romans were not without justification when they spoke of a εὐδαίμων Ἀραβία, Arabia Felix, though their ideas of the character and extent of this “rich”[12] country were for the most part tolerably vague.[13] But several passages in the Old Testament bear witness to the high repute of the glory and splendour of the Sabæans. This is particularly evident in the legend of the queen of Sheba’s visit to Solomon (1 Kings x, 1-10). Not the least part of the wealth of the Sabæans was due to their monopoly of the trade in certain fragrant substances, especially in the incense which in old times was used in immense quantities at sacrifices. These perfumes, especially incense, are mentioned in various passages of the Old Testament, together with gold and precious stones, as amongst the treasures of the Sabæans (1 Kings x, 2, 10; Jeremiah vi, 20; Ezekiel xxvii, 22; Isaiah lx, 6). These and other products were carried to the north by Sabæan caravans (cf. Isaiah lx, 6; Tobit vi, 16). In the inscriptions of northern Hijaz we now have documentary evidence to prove that the Sabæans established permanent trading-stations at a distance from their own country. At the height of their prosperity they must have exercised a civilising influence of no mean importance upon the rest of Arabia, especially upon those parts of the west which they traversed in their regular journeys. To them the Thamudæans, with whose buildings (known before only by the report of Arab writers) the labours of Doughty and Euting have made us acquainted, and the Nabatæans, who were closely connected with the Thamudæans, probably owed the first elements of their culture. Written characters, which came to the Sabæans from the north in very early days, were by them disseminated in every kind of transmutation over large portions of Arabia, as far as the neighbourhood of Damascus on the one hand and Abyssinia on the other. Nevertheless, take it all in all, the civilisation of the ancient Yemen bore little fruit for the world beyond. The countries about the Mediterranean received no intellectual stimulus worth speaking of from this remote region, nor did the old Semitic civilisation, nor Iran, receive more. And since the glory of the land of the Sabæans has departed its influence on other Arabs has become insignificant.
The decadence of the nation was probably due to various causes. It is certain that the Arab tradition which sees in it the effect of a single catastrophe—the bursting of the dam at Marib, which was indispensable for regular irrigation—is far from being an adequate explanation. The bursting of the dam must itself have been the consequence of neglect on the part of a degenerate race. But there may well be some truth in the tradition, which connects the decline of this remarkable people, indirectly, at least, with the great migration of Yemenite tribes to the north. At that time—about the second century A.D.—a kind of retrograde movement seems to have set in throughout the civilisation of a large part of Arabia. At certain periods large numbers of Arabs had been able to write, at least in rude characters, as is sufficiently proved by numerous brief inscriptions; about the year 600 the art of writing in Arabia was the secret of the few. Even in Yemen tolerably trustworthy traditions of its palmy days survived only amongst individuals. The conquest of the country by the hated Abyssinians (525 A.D.) probably shattered the last remnants of national vigour, and the Persian conquest (about 570 A.D.) failed to quicken it afresh. It is true that the civilisation of Yemen was still superior to that of the rest of Arabia; for example, it carried on a fairly important manufacture of weapons and materials for garments. A dim consciousness still survived of great things that the country had wrought. But, since there were no historic records of such, the later Yemenites endeavoured to vindicate the fame of their forefathers by extravagant inventions and to show that they had done far greater deeds than were done by the Koreishites at the head of the Moslems.