1. In olden time the Arabian desert was, as it is at this day, the roaming-ground of independent Bedouin tribes. With free and healthy minds they contemplated their monotonous world, whose highest charm was the raid, and whose intellectual treasure was the tribal tradition. Neither the achievements of social labour, nor the accomplishments of elegant leisure were known to them. Only on the borders of the desert, in regularly constituted communities, which often had to suffer from the incursions of those Bedouins, a higher degree of civilization had been attained. This was the case in the South, where the ancient kingdom of the Queen of Sheba continued its existence in Christian times under Abyssinian or Persian overlordship. On the West lay Mecca and Medina (Yathrib), by an old caravan route; and Mecca in particular, with its market safe-guarded by a temple, was the centre of a brisk traffic. Lastly on the North, two semi-sovereign States had been formed under Arab princes: towards Persia, the kingdom of the Lakhmids in Hira; and towards Byzantium the dominion of the Gassanids in Syria. In speech and poetry, however, the unity of the Arab nation was set forth to some extent even before Mohammed’s time. The poets were the ‘men of knowledge’ for their people. Their incantations held good as oracles, first of all for their several tribes, but no doubt extending their influence often beyond their own particular septs. 2. Mohammed and his immediate successors, Abu Bekr, Omar, Othman and Ali (622–661) succeeded in inspiring the free sons of the desert, together with the more civilized inhabitants of the coast-lands, with enthusiasm for a joint enterprise. To this circumstance Islam owes its world-position: for Allah showed himself great, and the world was quite small for those who surrendered themselves to him (Muslims). In a short time the whole of Persia was conquered, and the East-Roman empire lost its fairest provinces,—Syria and Egypt. Medina was the seat of the first Caliphs or representatives of the prophet. Then Mohammed’s brave son-in-law Ali, and Ali’s sons, fell before Moawiya, the able governor of Syria. From that time dates the existence of the party of Ali (Shiʻites), which in the course of diverse vicissitudes,—now reduced to subjection, now in detached places attaining power,—lives on in history, until it finally incorporates itself with the Persian kingdom in definite opposition to Sunnite Islam. In their struggle against the secular power the Shiʻites availed themselves of every possible weapon,—even of science. Very early there appears among them the sect of the Kaisanites, which ascribes to Ali and his heirs a superhuman secret lore, by the help of which the inner meaning of the Divine revelation first becomes clear, but which demands from its devotees not less faith in, and absolute obedience to, the possessor of such knowledge, than does the letter of the Koran. (Cf. III, 2 § 1).