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The painting, which dates back to the Nero-Flavian period (62 – 79 AD), was found on August 24th 1765 in the eastern side of the northern portico of the Temple of Isis.
It presents an Isiac priest in the foreground; he reads the ritual formula on a roll held in his hands. He wears a white long fringed robe knotted on the chest and cane sandals; he wears a gold bulla (a medallion with two valves) around his neck and two ostrich feathers on his head. He is a hierogrammateus, also called pretoforo, for the two ostrich feathers that adorned his forehead.
On the pillar, behind the priest, is crouched a black cat with a lotus flower on its head, a reference to Bast, the solar cat-shaped goddess who accompanies and protects Ra (the god of the Sun) against the snake originally hostile to him.