Pistol wrote: "Many evidences converge: Atum becomes Atum Re, ben-ben becomes bennu, Osiris and Isis...etc, these occur in the 5th dynasty..."

The oldest evidence for the presence of a cult of Re in Heliopolis date from the reign of Teti (6th dyn); fragment of an obelisk and the oldest high priest of Re (prior to the reign of Teti only high priests of Atum are known). It is highly probable that after abandoning the 5th dyn solar temples the priesthood of Re moved to Heliopolis where over time the cult became connected with that of Atum. A block depicting Amun and Ra from the reign of Pepi II found in Saqqara is the oldest iconographic evidence for a merging of the two cults.