Together with Carneades and Critolaus, he was sent to Rome to appeal a fine of hundred talents imposed on Athens in 155 BC for the sack of Oropus. They delivered their epideictic speeches first in numerous private assemblies, then in the Senate. Diogenes pleased his audience chiefly by his sober and temperate mode of speaking.[2]
Cicero calls Diogenes "a great and important Stoic."[3] In the works of the Epicurean philosopher Philodemus found in carbonized papyrus rolls recovered from the ruins of the Villa of the Papyri at Herculaneum, Diogenes is discussed more frequently than any philosopher besides Epicurus himself.[4]
He was the author of several works, of which, however, little more than the titles is known:
There are several passages in Cicero from which we may infer that Diogenes wrote on other subjects also, such as duty, the highest good, and the like.[12]
According to Lucian[13], Diogenes died at the age of 88; since in Cicero's Cato Maior, he is spoken of as deceased, he must have died before 151 BC.