Why was The Cult of Arsinoë II Philadelphus established in Egyptian Temples?

The cult of Arsinoë II Philadelphus is considered one of the most significant cults in Hellenistic Egypt. It originated from the Greek oriented cult of Theoi-Adelphoi after Arsinoë’s death and soon became a vital part of both Greek and Egyptian religious life. What is even more important, Arsinoë became the first member of Ptolemaic dynasty to receive such a cult in Egyptian temples. Yet we still do not quite understand why was it so prominently established there. This article proposes a possible answer to this question. Based on the information from Sais inscription, a source from the reign of Ptolemy II, we can conclude that the main reason for the spread of the cult of Arsinoë in Egyptian temples was the natural conditions that developed in Egypt in the mid-260s. BCE. The text mentions a certain deficiency of the land during the king’s visit to Sais in 265/64 BCE. It seems that at this time Egypt faced low floods of the Nile, which could possibly lead to a lack of crops throughout the country. This in turn could threaten the legitimacy of Ptolemy II, who, as a king of Egypt, was viewed as the one responsible for the floods of the Nile river. Thus an event like this could become a cause for major instability in society or even a revolt. Under these circumstances the cult of Arsinoë II Philadelphus was used to promote royal legitimacy and bind part of the Egyptian priesthood to the ruling house of the Ptolemies.