If we try to trace the historic basis of the Osiris myth, we must take into account the early customs and ideas among which the myths arose. The cutting up of the body was the regular ritual of the prehistoric people, and (even as late as the fifth dynasty) the bones were separately treated, and even wrapped up separately when the body was reunited for burial. We must also notice the apotheosis festival of the king, which was probably his sacrificial death and union with the god, in the prehistoric age. The course of events which might have served as the basis for the Osiris myth may then have been somewhat as follows. Osiris was the god of a tribe which occupied a large part of Egypt. The kings of this tribe were sacrificed after thirty years' reign (like the killing of kings at fixed intervals elsewhere), and they thus became the Osiris himself. Their bodies were dismembered, as usual at that period, the flesh ceremonially eaten by the assembled people (as was done in prehistoric times), and the bones distributed among the various centres of the tribe, the head to Abydos, the neck, spine, limbs, etc., to various places, of which there were fourteen in all. The worshippers of Set broke in upon this people, stopped this worship, or killed Osiris, as was said, and established the dominion of their animal god. They were in turn attacked by the Isis worshippers, who joined the older population of the Osiris tribe, re-opened the shrines, and established Osiris worship again. The Set tribe returning in force attacked the Osiris tribe and scattered all the relics of the shrines in every part of the land. To re-establish their power, the Osiris and Isis tribes called in the worshippers of the hawk Horus, who were old enemies of the Set tribe, and with their help finally expelled the Set worshippers from the whole country. Such a history, somewhat misunderstood in a later age when the sacrifice of kings and anthropophagy was forgotten, would give the basis for nearly all the features of the Osiris myth as recorded in Roman times.

If we try to materialise this history more closely we see that the Osiris worshippers occupied both the Delta and Upper Egypt, and that fourteen important centres were recognised at the earliest time, which afterwards became the capitals of nomes, and were added to until they numbered forty-two divisions in later ages. Set was the god of the Asiatic invaders who broke in upon this civilisation; and about a quarter through the long ages of the prehistoric culture (perhaps 7500 B.C.) we find material evidences of considerable changes brought in from the Arabian or Semitic side. It may not be unlikely that this was the first triumph of Set. The Isis worshippers came from the Delta, where Isis was worshipped at Buto as a virgin goddess, apart from Osiris or Horus. These followers of Isis succeeded in helping the rest of the early Libyan inhabitants to resist the Set worship, and re-establish Osiris. The close of the prehistoric age is marked by a great decline in work and abilities, very likely due to more trouble from Asia, when Set scattered the relics of Osiris. Lastly, we cannot avoid seeing in the Horus triumph the conquest of Egypt by the dynastic race who came down from the district of Edfu and Hierakonpolis, the centres of Horus worship; and helped the older inhabitants to drive out the Asiatics. Nearly the same chain of events is seen in later times, when the Berber king Aahmes I helped the Egyptians to expel the Hyksos. If we can thus succeed in connecting the archaeology of the prehistoric age with the history preserved in the myths, it shows that Osiris must have been the national god as early as the beginning of prehistoric culture. His civilising mission may well have been the introduction of cultivation, at about 8000 B.C., into the Nile valley.

The theology of Osiris was at first that of a god of those holy fields in which the souls of the dead enjoyed a future life. There was necessarily some selection to exclude the wicked from such happiness, and Osiris judged each soul whether it were worthy. This judgment became elaborated in detailed scenes, where Isis and Neb-hat stand behind Osiris who is on his throne, Anubis leads in the soul, the heart is placed in the balance, and Thōth stands to weigh it and to record the result. The occupations of the souls in this future we have noticed in chapter iii. The function of Osiris was therefore the reception and rule of the dead, and we never find him as a god of action or patronising any of the affairs of life.

Isis (Aset or Isit) became attached at a very early time to the Osiris worship; and appears in later myths as the sister and wife of Osiris. But she always remained on a very different plane to Osiris. Her worship and priesthood were far more popular than those of Osiris, persons were named after her much more often than after Osiris, and she appears far more usually in the activities of life. Her union in the Osiris myth by no moans blotted out her independent position and importance as a deity, though it gave her a far more widespread devotion. The union of Horus with the myth, and the establishment of Isis as the mother goddess, was the main mode of her importance in later times. Isis as the nursing mother is seldom shown until the twenty-sixth dynasty; then the type continually became more popular, until it outgrew all other religions of the country. In the Roman times the mother Isis not only received the devotion of all Egypt, but her worship spread rapidly abroad, like that of Mithra. It became the popular devotion of Italy; and, after a change of name due to the growth of Christianity, she has continued to receive the adoration of a large part of Europe down to the present day as the Madonna.

Nephthys (Neb-hat) was a shadowy double of Isis; reputedly her sister, and always associated with her, she seems to have no other function. Her name, 'mistress of the palace,' suggests that she was the consort of Osiris at the first, as a necessary but passive complement in the system of his kingdom. When the active Isis worship entered into the renovation of Osiris, Nebhat remained of nominal importance, but practically ignored.

Horus (Heru or Horu) has a more complex history than any other god. We cannot assign the various stages of it with certainty, but we can discriminate the following ideas. (A) There was an elder or greater Horus, Hor-ur (or Aroeris of the Greeks) who was credited with being the brother of Osiris, older than Isis, Set, or Nephthys. He was always in human form, and was the god of Letopolis. This seems to have been the primitive god of a tribe cognate to the Osiris worshippers. What connection this god had with the hawk we do not know; often Horus is found written without the hawk, simply as hr, with the meaning of 'upper' or 'above.' This word generally has the determinative of sky, and so means primitively the sky or one belonging to the sky. It is at least possible that there was a sky-god her at Letopolis, and likewise the hawk-god was a sky-god her at Edfu, and hence the mixture of the two deities. (B) The hawk-god of the south, at Edfu and Hierakonpolis, became so firmly embedded in the myth as the avenger of Osiris, that we must accept the southern people as the ejectors of the Set tribe. It is always the hawk-headed Horus who wars against Set, and attends on the enthroned Osiris. (C) The hawk Horus became identified with the sun-god, and hence came the winged solar disk as the emblem of Horus of Edfu, and the title of Horus on the horizons (at rising and setting) Hor-em-akhti, Harmakhis of the Greeks. (D) Another aspect resulting from Horus being the 'sky' god, was that the sun and moon were his two eyes; hence he was Hor-merti, Horus of the two eyes, and the sacred eye of Horus (uza) became the most usual of all amulets. (E) Horus, as conqueror of Set, appears as the hawk standing on the sign of gold, nub; nubti was the title of Set, and thus Horus is shown trampling upon Set; this became a usual title of the kings. There are many less important forms of Horus, but the form which outgrew all others in popular estimation was (F) Hor-pe-khroti, Harpokrates of the Greeks, 'Horus the child.' As the son of Isis he constantly appears from the nineteenth dynasty onward. One of the earlier of these forms is that of the boy Horus standing upon crocodiles, and grasping scorpions and noxious animals in his hands. This type was a favourite amulet down to Ptolemaic times, and is often found carved in stone to be placed in a house, but was scarcely ever made in other materials or for suspension on the person. The form of the young Horus seated on an open lotus flower was also popular in the Greek times. But the infant Horus with his finger to his lips was the most popular form of all, sometimes alone, sometimes on his mother's lap. The finger, which pointed to his being a sucking child, was absurdly misunderstood by the Greeks as an emblem of silence. From the twenty-sixth dynasty down to late Roman times the infant Horus, or the young boy, was the most prominent subject on the temples, and the commonest figure in the homes of the people.

The other main group of human gods was Amon, Mut, and Khonsu of Thebes. Amon was the local god of Karnak, and owed his importance in Egypt to the political rise of his district. The Theban kingdom of the twelfth dynasty spread his fame, the great kings of the eighteenth and nineteenth dynasty ascribed their victories to Amon, his high priest became a political power which absorbed the state after the twentieth dynasty, and the importance of the god only ceased with the fall of his city. The original attributes and the origin of the name of Amon are unknown; but he became combined with Ra, the sun-god, and as Amon-Ra he was 'king of the gods,' and 'lord of the thrones of the world.' The supremacy of Amon was for some centuries an article of political faith, and many other gods were merged in him, and only survived as aspects of the great god of all. The queens were the high priestesses of the god, and he was the divine father of their children; the kings being only incarnations of Amon in their relation to the queens.

Mut, the great mother, was the goddess of Thebes, and hence the consort of Amon. She is often shown as leading and protecting the kings, and the queens appear in the character of this goddess. Little is known about her otherwise, and she disappears in the later theology.