The first historical phase noticed is one of pure theocracy, in which the Caliph or successor of Mohammed was saint as well as priest and king, and was to a certain extent inspired. It lasted thirty years only, and is represented by the four great Caliphs—Abu Bekr, Omar, Othman, and Ali—who receive from the faithful when they speak of them the title of Seydna, or Our Lord.

The second phase, which lasted nearly six hundred years, is that of the Arabian monarchy, in which the Caliphate took the shape of hereditary temporal dominion. Its representatives are neither saints nor doctors of the law, and stand on a quite different footing from those who precede them. They begin with Mawiyeh ibn Ommiyah, founder of the Ommiad dynasty, and end with Mostasem Billah, the last Sultan of the Abbasides.

The third period is a phase of temporal inter-regnum during which for nearly three hundred years the Khalifeh exercised no sovereign rights, and resided as a spiritual chief only, or as we should now say Sheykh el Islam, at Cairo. The temporal authority of Islam, which is theoretically supposed to have been continued without break even during this period, was then in delegation with the Memluk Sultans of Egypt and other Mussulman princes.

The last phase is that of the Ottoman Caliphate.

As nearly all modern arguments respecting the Caliphate appeal to examples in the earliest period, it will be well to consider the origin of its institution and the political basis of Islam itself. Mohammedan doctors affirm that the Apostle of God, Mohammed (on whose name be peace), when he fled from Mecca, did so not as a rebellious citizen but as a pretender to authority. He was by birth a prince of the princely house of the Koreysh, itself the noblest tribe of Hejaz, and his grandfather had been supreme ruler in Mecca. He established himself, therefore, with his companions in exile as head of an independent political community, following in this the ancient custom of Arabia where sections constantly cut themselves off from the parent tribe and form new nations under the separate leadership of one or another member of their princely families. Islam, therefore, was from its commencement a political as well as a religious body, and while Mohammed preached to his disciples as a prophet, he also gave laws to them as their king and governor. He was their Imam, the leader of their prayer, and he was their Emir and Kadi, prince and magistrate. Thus the supreme temporal and spiritual authority became linked, and Islam was from its beginning a nation no less than a church.

As long as Mohammed lived, this state of things remained unquestioned, and difficulties began only at his death. It is a point which has been much disputed what were the prophet's intentions regarding this event. In early times the sect of Ali maintained that he had appointed his son-in-law his heir, and others have held that Abu Bekr had the nomination; but Sunites are now mostly agreed that no individual appointment was made, and that the choice of a successor was left to be decided by election. In any case the procedure followed by Mohammed's bereaved followers was elective, and its details were in strict accordance with that Arabian custom on which the Koranic law is mainly built.

Now, in an Arab tribe, when the Sheykh dies, the elders of the tribe, heads of its great houses and sections, assemble in one of their number's tent and, sitting in a circle, discuss the subject of his succession. Theoretically, the choice of a successor is open to any one of them, for the tribe, however large, is all one great family, descended from a common ancestor, and though no one from without could be admitted to the supreme rule, any one from within the tribe can hold office. But in practice the choice is limited to a few persons. The reverence of the Arabs for blood, and for selected strains of blood, prevent them, except in very exceptional cases, from changing the dynasty of their rulers. If the dead man has left behind him a son of full age and respectable qualities, he will, without dispute, be acknowledged Sheykh. If not, an uncle, a nephew, or a cousin will be chosen. Only in extreme circumstances of general danger, or of failure of heirs male, can the member of a new family reasonably aspire to power. Moreover, there is no uniform law of election. The meeting does not pretend to give a right, only to confirm one; for the right lies not with the electors but with him who can maintain his election. There is, therefore, no formal system of voting, but the elders having ascertained who among the dead man's relations commands the strongest following, proceed to acknowledge him by the ceremony of giving him their hands. He then becomes their Sheykh. It sometimes happens, however, that parties are so evenly divided between rival leaders that the tribe divides, one section going this way and the other that, until one of the leaders gives in his submission; otherwise the quarrel is decided by the sword.

All these features of the Arabian tribal system of succession may be noticed in the first elections to the Caliphate. As soon as it was known that Mohammed was indeed dead, a conclave composed of the elders and chief men of Islam, self-constituted and recognizing no special popular mandate, assembled in the house of Omar ibn el Khattub. This conclave is known to jurists as the Ahl el helli wa el agde, the people of the loosing and the knotting, because they assumed the duty of solving the knotty question of succession. A nice point had to be decided, just such a one as has in all ages been the cause of civil war in Arabia. The Prophet had left no son, but more than one near relation. Moreover, at that moment the new nation of Islam was in danger of internal disruption, and the religious and the civil elements in it were on the point of taking up arms against each other. The two chief candidates were Ali ibn Abutaleb and Abu Bekr, the one son-in-law and cousin and the other father-in-law of Mohammed—Ali represented the civil, Abu Bekr the religious party; and as it happened that the latter party was predominant at Medina, it was on Abu Bekr that the choice fell. He was recognized as head of the more powerful faction, and the chiefs gave him their hands; while civil war was only prevented by the magnanimous submission of Ali.

This form of succession is held by most Sunite doctors to be the authentic form intended by the Prophet, nor did the three following elections differ from it in any essential point. It is only noticed that Abu Bekr designated Omar as the most fitting person to succeed him, and so in a measure directed the choice of the Ahl el agde. The Caliph was in each instance elected by the elders at Medina, and the choice confirmed by its general acknowledgment elsewhere.

In the time of Ali, however, a new principle began to make its appearance, which foreshadowed a change in the nature of the Caliphate. The election of Abu Bekr, as I have said, was determined by the predominant religious feeling of the day. He was the holiest man in Islam, and his government was throughout strictly theocratic. He not only administered the religious law, but was its interpreter and architect. He sat every day in the mejlis, or open court of justice, and decided there questions of divinity as well as of jurisprudence. He publicly led the prayer in the Mosque, expounded the Koran, and preached every Friday from the pulpit. He combined in his person all the functions now divided between the Sheykh el Islam, the grand Mufti, and the executive authorities. He was king and priest and magistrate, doctor of civil and religious law, and supreme referee on all matters whether of opinion or practice; he was, in a word, the Pope of Islam. Nor did his three successors abate anything of Abu Bekr's pretensions. The only power they delegated was the command of the Mussulman armies, which were then overrunning the world, and the government of the provinces these had conquered.