An island in the Nile at Elephantine near Aswan, the site of one of the finest surviving temples of the Ptolemaic period. The most important of the complex of temples is that of Isis to whom the island was considered sacred. The earliest standing monument dates from the reign of Nectanebo I (380-362 BC). Other buildings were erected by the Ptolemaic kings and early Roman emperors. During the Nubian Rescue Campaign, the temples of Philae were dismantled and re-erected on the island of Agilkia. Inscriptions in Greek and hieroglyphs on a commemorative obelisk at Philae supplemented the evidence of the Rosetta Stone to give Champollion the key to the ancient Egyptian writings.