The
ancient Egyptians created several enneads as their
unification under brought numerous local cults into contact with one another. The ancient Egyptian mythology often had many different explanations for the same phenomenon. This concept is especially unique because no single story was more accurate than another, but rather the truth was a mix of them all. may reference the
Pleiades. The most important was the "Great" or "Heliopolitan Ennead" of Awanu (), known under the
Greeks and
Romans as
Heliopolis. It celebrated the family of the
sun god Atum (sometimes referred to as
Atum-re) and thrived from the
Old Kingdom to the
Ptolemaic period. Its development remains uncertain, although it appears to have first appeared when
Ra's cult – supreme under – declined in importance under .
Egyptologists have traditionally theorized that the Heliopolitan priesthood established it to establish the preeminence of Atum over the others, incorporating some major gods in lesser positions and omitting others entirely. The most prominent of such deities was
Osiris,
god of vegetation and the
afterlife, who was incorporated into the ennead as Atum's great-grandson. However, in the 20th century, some Egyptologists question the whole scenario. After the Great Ennead was well established, the cult of Ra –
identified with Atum – recovered much of its importance until superseded by the cult of
Horus. The two were then combined as
Ra-Horus of the Horizons. ==Mythology==