Anacleteria

Anacleteria, were feasts celebrated in Greek antiquity in honor of kings and princes. Anacleteria were celebrated when rulers took upon themselves the administration of their state, and made a solemn declaration thereof to the people.
The anacleteria of Ptolemy V Epiphanes was recorded in Polybius' Histories; Polybius writes that Ptolemy's courtier's "thought that the kingdom would gain a certain degree of firmness and a fresh impulse towards prosperity, if it were known that the king had assumed the independent direction of the government."