Simmias of Thebes appears as a main discussion partner in a dialogue from the man who founded what?
Plato Plato ( ; Greek: Πλάτων "Plátōn", ] in Classical Attic; 428/427 or 424/423 – 348/347 BC) was a philosopher in Classical Greece and the founder of the Academy in Athens, the first institution of higher learning in the Western world. He is widely considered the most pivotal figure in the development of philosophy, especially the Western tradition. Unlike nearly all of his philosophical contemporaries, Plato's entire work is believed to have survived intact for over 2,400 years. Others believe that the oldest extant manuscript dates to around AD 895, 1100 years after Plato's death. This makes it difficult to know exactly what Plato wrote.
Heliodorus (philosopher) Heliodorus (Greek: Ἡλιόδωρος ) is cited as the author of a work titled "Commentary" (dated 564 AD), which has been preserved, on the "Introduction" or "Rudiments" of Paulus Alexandrinus, the 4th century Alexandrian astrologer. The name "Heliodorus" appears only on the later of two groups of manuscripts, and so is somewhat doubtful. Leendert Westerink has argued that the commentary consists of notes of lectures, most likely given by the 6th-century philosopher and astrologer, Olympiodorus, in 564 AD. The Greek text of his commentary on Aristotle's "Nicomachean Ethics" has been published in vol. 19.2 of "Commentaria in Aristotelem Graeca" (CAG).