Heliopolis, Egyptian Iunu, the pillars, biblical On, was the seat of the Ennead and the Ra priesthood for millennia: the benben, the primordial mound where creation began, the benu bird that became the phoenix, the Atum-Ra theology of the self-created sun. Its priests wrote the Pyramid Texts' solar religion. Genesis marries Joseph to Asenath, daughter of a priest of On. Obelisks, the city's signature, solidified sunbeams in stone, were later harvested as trophies: Cleopatra's Needle to London and New York, a dozen to Rome, where they still stand in piazzas, repurposed as imperial punctuation.
Heliopolis's real export was intellectual: the solar cosmology, the dying-and-rising sun, the doctrine that order must be renewed daily, became the grammar of Egyptian religion and, through Alexandria, fed Hermeticism, Neoplatonism, and the sun-language of the empire's cults. Herodotus and Plato both visited its priests, or claimed to. The city declined as the temples closed, and its site is a Cairo suburb now, one obelisk left standing in a field, the sunbeam that stayed home.
The claim: Heliopolis invented religious franchising, one solar theology licensed to every pharaoh, then to every empire that stole its stones, the obelisk as the original viral monument, and the pattern continues: whoever controls the sun-symbol controls the legitimacy, from Ra's cartouche to Constantine's cross-above-the-sun to every flag with a disc on it. Verdict: the obelisk trail is the receipt, Rome, London, New York, each empire physically importing the sun-city's authority. The cult of On ended. The franchise is still expanding. Check your nearest skyline.
If the sun-city's stones were carted to every later empire, whose cult actually won?