Ancilla to the Pre-Socratic Philosophers: 53. Diocles, Echecrates, Polymnastus, Phantôn, Arîôn of Phliûs 53. DIOCLES, ECHECRATES, POLYMNASTUS, PHANTÔN, ARÎÔN OF PHLIÛS Diocles, Echecrates, Polymnastus, Phantôn, Arîôn of Phliûs: beginning of fourth century. They formed a Pythagorean 'cell' at Phlius; no writings are known.