On the sacred island of Philae near Aswan, he began the temple of Isis, which would become one of the most important religious sites in ancient Egypt, by erecting its vestibule.[1][12] Nectanebo also began the First Pylon in the Precinct of Amun-Re at Karnak, and it is believed that the earliest known mammisi, which was found at Dendera, was built by him.[12][13] The cult of sacred animals, which became prominent between the two Persian occupation periods (the 27th and 31st dynasties respectively), was supported by Nectanebo as evidenced by archaeological findings at Hermopolis, Hermopolis Parva, Saft el-Hinna and Mendes. Further works ordered by the pharaoh have been found in religious buildings at Memphis, Tanis and El Kab.[13][14]