C4 BCE (Middle Comedy). OCD4 Xenarchus(2), by W.G. Arnott.
[1] Athenaeus, Deipnosophists 2.63F [2.64 Kaibel]. (On Athenaeus and the Deipnosophists -- which in fact supplies all eight of these titles: references in notes below -- see generally alpha 731.)
[2] Athenaeus, Deipnosophists 6.225C [6.6 Kaibel], 7.319A [7.108], 9.367A [9.2], 10.418D [10.12], 10.431A [10.37]. (In some of these passages the attribution of the first of these titles is hedged between Xenarchos and Timokles: see tau 624.)
[3] Athenaeus, Deipnosophists 10.426B [10.27 Kaibel], 10.440E [10.56], 10.441E [10.57], 11.473F [11.47], 13.559A [13.7], 13.569A [13.24], 15.679E [15.25], 15.693B [15.47]. (The correct title for Pentathlete seems actually to be Pentathlon.)