Demetrius Lacon or Demetrius of Laconia (; fl. late 2nd century BC) was an Epicurean philosopher, and a disciple of Protarchus.Diogenes Laertius, x. 26; Strabo, xiv. 2. 20 He was an older contemporary of Zeno of Sidon and a teacher of Philodemus. Sextus Empiricus quotes part of a commentary by Demetrius on Epicurus, where Demetrius interprets Epicurus' statement that "time is an accident of accidents."Sextus Empiricus, Against the professors, 10.219-27

Papyrus scrolls containing portions of the works of Demetrius were discovered at the Villa of the Papyri at Herculaneum. The major works partially preserved are:John T. Fitzgerald, Dirk Obbink, Glenn Stanfield Holland, (2004), Philodemus and the New Testament World, page 10. BRILL. Quaestiones convivales (PHerc. 1006) On the Puzzles of Polyaenus (PHerc. 1083, 1258, 1429, 1642, 1647, 1822) On Geometry (PHerc. 1061) On Poems (PHerc. 188, 1014)Demetrius Lacon, La poesia: (PHerc. 188 e 1014), ed. Costantina Romeo. Naples 1988. two untitled works (PHerc. 1786, 124)

In addition, he is the probable author of the following works: On the Size of the Sun (PHerc. 1013) On Fickleness (PHerc. 831) an untitled work on textual criticism of Epicurus' writings (PHerc. 1012)Demetrius Lacon, Aporie testuali ed esegetiche in Epicuro (PHerc. 1012), ed. Enzo Puglia. Naples 1988.

an untitled theological work (PHerc. 1055)Demetrius, Lacon, La forma del Dio: PHerc. 1055, ed. Mariacarolina Santoro. Naples 2000. an untitled rhetorical work (PHerc. 128)

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