The Rosetta Stone, issued on March 27, 196 BCE, proclaims clearly and for the first time that we know for certain the coronation of the king at Memphis, the traditional Egyptian capital, and decrees measures which will secure the loyalty and support of the native priesthood-
“Since King Ptolemy, the ever-living, beloved of Ptah, the god Manifest and Beneficent, born of King Ptolemy and Queen Arsinoe, Father-loving gods, has conferred many benefits on the temples and those who dwell in them and on all the subjects in his kingdom, being a god born of a god and goddess—just as Horus son of Isis and Osiris who avenged his father Osiris…”
Bowman, Alan K. Egypt After the Pharaohs 332 BC – AD 642. London- British Museum Press- 1986.