Note:  Do not rely on this information. It is very old.

Heliopolis

Heliopolis, "the City of the Sun," called by the Egyptians On, was situated on the most eastern branch of the Nile near Pelusium. It was the chief of the sacred cities of Egypt. To it Solon and Plato are said to have resorted, and among the chief priests were Manetho and Potiphar. Near it is still to be seen an obelisk called Pharaoh's Needle, and Cleopatra's Needle was also originally here. This place is not to be confounded with Baalbec or Syrian Heliopolis.