"According to Diodorus Siculus Heliopolis was built by Actis, one of the sons of Helios and Rhode, who named the city after his father.[4] While all Greek cities were destroyed during the flood, the Egyptian cities including Heliopolis survived. The chief deity of Heliopolis was the god Atum, who was worshipped in the primary temple, which was known by the names Per-Aat (*Par-ʻĀʼat, written pr-ꜥꜣt, 'Great House') and Per-Atum (*Par-ʼAtāma, written pr-ỉtmw 'Temple [lit. 'House'] of Atum"' > Hebrew פתם‎ Pithom). The city was also the original source of the worship of the Ennead pantheon, although in later times, as Horus gained in prominence, worship focused on the syncretic solar deity Ra-harakhty (literally Ra, [who is] Horus of the Two Horizons). During the Amarna Period, King Akhenaten introduced monotheistic worship of Aton, the deified solar disc, built here a temple named Wetjes Aton (wṯs ỉtn "Elevating the Sun-disc"). Blocks from this temple were later used to build the city walls of mediaeval Cairo and can be seen in some of the city gates. The cult of the Mnevis bull, an embodiment of the god Ra, had its centre here, and possessed a formal burial ground north of the city.

As the capital of Egypt for a period of time, grain was stored in Heliopolis for the winter months, when many people would descend on the town to be fed, leading to it gaining the title place of bread." 

curiusly, in the old Hebrew bêth lehem means the "house of bread." ya, where Jesus was born, in Heliopolis.

"Heliopolis (Greek: Ἡλιούπολις, "City of the Sun" or "City of Helios"; Egyptian: ỉwnw; Arabic: عين شمس, Ain Shams, "Eye of the Sun") was one of the oldest cities of ancient Egypt. Located in the apex of the Nile Delta, Heliopolis was the capital of the 13th Lower Egyptian nome."

notice number 13.