2nd–1st century BC (exact dates uncertain). From Miletus, active partly in Athens/Italy. Wrote in Greek. A scholarly Epicurean known for detailed polemical and technical works; substantial papyrus fragments of his writing were recovered from the Villa of the Papyri at Herculaneum.
1. Key Texts
But Demetrius the Laconian, one of the notables of the Epicurean School, used to declare that this sort of objection is easy to dispose of, "for," says he, "when we have established one of the particular proofs (for example, that which deduces that indivisible elements exist, or that void exists) and shown that it is sure, we shall at once have secured, as included in this, the trustworthiness of generic proof; for where there exists the particular of a genus, there we certainly find also the genus of which it is the particular." (Bury)