Horapollo (from Horus Apollo; ) is the supposed author of a treatise, titled Hieroglyphica, on Egyptian hieroglyphs, extant in a Greek translation by one Philippus, dating to about the 5th century. Life Horapollo is mentioned by the Suda (ω 159) as one of the last leaders of the Egyptian priesthood at a school in Menouthis, near Alexandria, during the reign of Zeno (AD 474–491). According to the Suda, Horapollo had to flee because he was accused of plotting a revolt against the Christians, and his temple to Isis and Osiris was destroyed. Horapollo was later captured and after torture converted to Christianity. Another, earlier, Horapollo alluded to by the Suda was a grammarian from Phanebytis, under Theodosius II (AD 408–450). To this Horapollo the Hieroglyphica was attributed by most 16th-century editors, although there were more occult opinions, identifying Horapollo with Horus himself, or with a pharaoh. Horapollo wrote commentaries on Sophocles, Alcaeus of Mytilene and Homer, and a work () on places consecrated to the gods. Photius (cod. 279), who calls him a dramatist as well as a grammarian, ascribes to him a history of the foundation and antiquities of Alexandria (unless this is by an Egyptian of the same name, who lived in the reign of Zeno, 474–491). Hieroglyphica The text of the Hieroglyphica consists of two books, containing a total of 189 explanations of Egyptian hieroglyphs. The books profess to be a translation from an Egyptian original into Greek by a certain Philippus, of whom nothing is known. The inferior Greek of the translation, and the character of the additions in the second book point to its being of late date; some have even assigned it to the 15th century. The text was discovered in 1419 on the island of Andros, and was taken to Florence by Cristoforo Buondelmonti (it is today kept at the Biblioteca Laurenziana, Plut. 69,27). By the end of the 15th century, the text became immensely popular among humanists and was translated into Latin by Giorgio Valla (in ms. Vat. lat. 3898). The first printed edition of the text appeared in 1505 (published by Manuzio), and was translated into Latin in 1517 by Filippo Fasanini, initiating a long sequence of editions and translations. From the 18th century, the book's authenticity was called into question, but modern Egyptology regards at least the first book as based on real knowledge of hieroglyphs, although confused, and with