It is quite clear that all this is an expression of dissatisfaction with the old belief in the simple duplicate world, the world of Earu under the earth. It is noteworthy that this first appears in royal tombs. These texts are written for kings alone. It is only many centuries later that the texts of the book of the dead showed similar possibilities open to the common man. This is the usual course of all advances in Egypt,-- architecture, sculpture, writing, whatever gain in skill or knowledge there is, appears first in the service of the royal family. Thus, even in the conception of immortality, the new ideas, the better immortality was first thought out for the benefit of the king. The basis for this lay simply in the life on earth. The king had come early to have a sort of divinity ascribed to him. His chief name was the Horus name. Menes was the Horus Aha; Cheops was the Horus Mejeru; Pepy II was the Horus Netery-khau. But he was also the son of Ra, the sun-god, endued with life forever. The king was a god, and it could only be that in his future life he shared the life of the gods. Thus, all is no more confused or mysterious than is the conception of the life of the gods themselves. But the texts go even further than this and identify the dead god-man, who as Horus was king on earth, with the father of Horus, the dead god of the earth, Osiris. This identification of the dead man with the dead god Osiris was later enlarged to include all men, and became in the Ptolemaic period the most characteristic feature of the Egyptian conception of life after death.