Temple of Philae from the Nile. The complex of structures of the Temple of Isis was completed by Ptolemy II Philadelphus (reigned 285–246 BCE) and his successor, Ptolemy III Euergetes (reigned 246–221 BCE). More than two thirds of Philae’s surviving structures were built in the Ptolemaic era, during which the island became a prominent site of pilgrimage not only for Egyptians and Nubians but for pilgrims from as far as Anatolia, Crete, and the Greek mainland..The Roman era saw an overall decline in pilgrimage to Philae.