1 The fragments of Nechepso and Petosiris edited and translated by Levente László – HOROI Project (http://horoiproject.com) original edition: July 14, 2023; first revision: March 27, 2024 Hellenistic astrologers frequently refer to or quote from the now-lost books attributed to Nechepso and Petosiris. The testimonies and fragments were first collected by Ernst Riess for his 1890 doctoral dissertation submitted to the University of Bonn (printed as Nechepsonis et Petosiridis fragmenta magica, Bonnae [Bonn] 1890), and this collection was subsequently published (“Nechepsonis et Petosiridis fragmenta magica,” Philologus suppl. 6 [1891–1893], 325–394). Riess did his best to collect everything related to Nechepso and Petosiris even though at that time, many sources had not yet been edited from or even discovered in the astrological manuscripts. In 2007, Stephan Heilen updated Riess’s list with the latest editions of Greek and Latin texts and added the newly discovered testimonies and fragments (“Some metrical fragments from Nechepsos and Petosiris,” in Isabelle Boehm et Wolfgang Hübner, eds., La poésie astrologique dans l’Antiquité, Paris 2011, 23–93; the list is republished in Heilen, Hadriani genitura, Berlin/Boston 2015, 40–47), also referring to Kim Ryholt’s assessment of the Demotic sources on Nechepso and Petosiris, which was published later (“New light on the legendary king Nechepsos of Egypt,” The Journal of Egyptian Archaeology 97 [2011], 61–72). However, a complete edition of Nechepso and Petosiris’s fragments is still lacking: on the one hand, unlike Riess, Heilen did not publish the text of the testimonies and fragments he assembled, and on the other, identifiable witnesses like Manilius and Theophilus have never been added to the collection. Also, Greek and Latin manuscripts and astrological papyri may still contain some undiscovered fragments, of which one case has already been discovered (Benjamin N. Dykes, Leopold of Austria: A Compilation on the Science of the Stars, Minneapolis [MN] 2015, 355 and my “Julianus of Laodicea and His Astrological Fragments,” Mnemosyne 75 [2022], 342). Until recently, it was generally presumed that Nechepso and Petosiris co-authored a definitive handbook that would become the canonical manual of virtually all subsequent astrology. As a result, many fragments that refer to the “ancients,” “men of old,” or “the Egyptians” in general but do not name them explicitly were conceived as belonging to these two persons whenever the slightest parallels with their attributed fragments were found. However, Joachim Quack (“Egypt as an astronomical-astrological centre between Mesopotamia, Greece, and India,” in David Brown, The Interactions of Ancient Astral Science, Bremen 2018, 69–123) called this assumption into question, claiming that a rich Egyptian astrological tradition is now known to have existed beyond what is associated with Nechepso and Petosiris; also, by compelling arguments, he suggested that the works attributed to them were not necessarily one and the same. Therefore, I present the translations of the known Greek and Latin texts referring to Nechepso and Petosiris by their names or in other reasonably unambiguous ways but omit those attributed to generic authors. The texts are arranged into thematic sections, in which I benefited from Heilen’s classification of the contents (“Some metrical fragments,” 25 = Hadriani genitura, 48–50). Within the sections, the joint testimonies and fragments of Nechepso and Petosiris come first, followed by separate subsections devoted to these two persons. The Demotic texts are not translated, but they are numbered, their contents are summarized, and the bibliographical data of the editions are given in the introductory sections.