Egyptian Heliopolis is a Creation myth originating from the Egyptian belief system. The oldest attested artifact in our index that contains this myth was likely created around 3000 BCE. The main deity depicted in this myth is likely Atum. Others include Geb, Isis, Nephthys, Nut, Shu, and Tefnet.
In a nutshell
The first main Egyptian deities and the rest of the world were created by Atum (later known as Ra or Horus) out of water. Atum gave rise to Shu and Tefnet, who later birthed the deities that would make up the rest of the world, including Isis and Osiris. Isis and Osiris may have represented fertility and motherhood, which gave rise to humanity.
"Utterances 575 and 600" is a 1952 English translation of the Pyramid Texts, Utterances 575 and 600, by Samuel A. B. Mercer. The lines seem to detail a creation myth related to the deity named Atum and the city of Heliopolis.
The Egyptian Heliopolis creation myth comes from the ancient Egyptian city of Heliopolis and was written during the predynastic times, as late as 3000 BCE according to Samuel A.B. Mercer. Other scholars tend to agree that it was likely produced during the rule of the fifth king of the sixth dynasty: Pepi II from ca. 2246–2152 BCE. At any rate, the Heliopolis creation story is therefore one of the oldest cosmogonic myths in the world. It showcases how Atum gave life to the other primary Egyptian deities. Heliopolis, north of Cairo, was a major cult city for Atum. It was nearby Memphis, where the Pyrmaid of Pepi II is actually located. The Heliopolis creation myth was also prominent during the old kingdom of Egypt.
Atum as the first man and chief creator
The Heliopolis creation narrative focuses on Atum, the deity closely related to the sun. It was said that Atum was created from a mound of dirt, whereby he created the other deities. According to David Leeming:
"The Pyramid Texts tell us that Atum existed alone in the universe and that he created his brother and sister, Shu (air-life) and Tefnut, by masturbating or, as some texts claimed, by expectorating." 
Indeed, the motif of ejaculation seems to be consistent among many different translators.
The Pyramid Texts tell us that Atum existed alone in the universe and that he created his brother and sister, Shu (air-life) and Tefnut, by masturbating or, as some texts claimed, by expectorating.
The attested date for the myth named 'Egyptian Heliopolis' is derived from the oldest artifact we have: Pyramid of Pepi II. The creation date for this artifact is a range because the exact date is unknown. We derived this from the source(s) listed below:
Mercer, Samuel A.B., trans. "Utterances 575 and 600." In The Pyramid Texts: In Translation and Commentary, Vol. I, vol. 1, 236-237 and 253-254, authored by Samuel A.B. Mercer. London, UK: Longmans, Green, & Co., 1952.
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