Excavations have shown that this city was important, therefore, the time of Herodotus and the Ptolemies, but especially during the Old Kingdom. It's Djoser of the third dynasty, who built a shrine to Re. According the Westcar papyrus, the first three kings of the Fifth Dynasty would have been the sons of the sun god and the wife of the high priest of Heliopolis.
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My notes of veracity :
Heliopolis, an ancient town of the suburb of Cairo: 4/5
Iounou, was the hieroglyphic names of Heliopolis: 3/5