This Proclus is to be distinguished from homonyms at pi 2470, pi 2471, pi 2473 (OCD(4) s.v.), and pi 2474. When the Syrian philosopher lived is uncertain -- perhaps in the 4th or 5th centuries CE (PLRE, s.v. Proclus).
[1] The ms. versions of this name are Themesion and Themision. Bernhardy emended to Themistion or Themison.
[2] The ancient Syrian city of Laodikeia is on the Mediterranean coast, the site of present-day Beirut, Lebanon; see Barrington Atlas map 69 grid C2. The Suda mentions Laodikeia or Laodikeians elsewhere (lambda 54, lambda 854, phi 768), but it is uncertain whether these refer to the Syrian coastal city; cf. OCD(4) s.v. Berytus.
[3] Proclus' commentary is lost. The Pandora myth is at Hesiod, Works and Days 60-105 (web address 1), and Theogony 560-612 (web address 2).
[4] Nicomachus (fl. ca. 100 CE) was a Neopythagorean mathematician with Platonist inclinations (O'Meara, pp. 14-23), pursuing musicology, and living in Gerasa (OCD(4) s.v. and Barrington Atlas map 69 grid C5), present-day Jerash, Jordan; OCD(4) s.v. Nicomachus(3). The Introduction is available in English translation (D'Ooge).