One of the large monuments on the site of the Amun/Heracles temple is the monolithic chapel in red granite, 174 centimeters high. It has some fragmentary inscriptions on its sides and contained the statue of the temple’s principal deity. The cartouches of the Lagid ruler who erected the naos in the temple when he came to power are damaged but, based on their actual length, he was probably a Ptolemy, between Ptolemy III Euergetes I and Ptolemy VIII Euergetes II. By comparing this discovery to the Royal Decree of Canopus which proved that the Greek place name "Heracleion" was the equivalent to the Egyptian "temple of Amun-Gereb at the mouth of the hone," identifying the deity to whom the temple was dedicated also secured the name of the discovered city: Heracleion.