Ptolemy I Soter rivals after Alexander's death. For example, Arrian's account of the fall of Thebes in 335 BC ("Anabasis" , a rare section of narrative explicitly attributed to Ptolemy by Arrian) shows several significant variations from the parallel account preserved in Diodorus Siculus (17.11–12), most notably in attributing a distinctly unheroic role in proceedings to Perdiccas. More recently, J. Roisman has argued that the case for Ptolemy's blackening of Perdiccas and others has been much exaggerated. Ptolemy personally sponsored the great mathematician Euclid. He found Euclid's seminal work, the "Elements", too difficult to study, so he asked if there were an easier
Aristobulus of Alexandria quoted by Anatolius. He is incorrectly named "Aristobulus of Paneas" in Rufinus' Latin translation of Eusebius' "Historia Ecclesiastica" (7, 32, 16). It is a wrong translation of the Greek ὁ πάνυ, "the Great". In addition, the author here quoted by Eusebius, Anatolius of Laodicea (270 CE), was mistaken in believing that Aristobulus was one of the 70 priests who translated the Torah into Greek (the "Septuagint") during the reign of Ptolemy II Philadelphus (3rd century BC). Anatolius of Laodicea incorrectly said that he lived in the time of Ptolemy Philadelphus. A further mistake in Rufinus' Latin translation of the Anatolius