The Eretrian school of philosophy was originally the School of

Elis Elis also known as Ellis or Ilia (, ''Eleia'') is a historic region in the western part of the Peloponnese peninsula of Greece. It is administered as a regional unit of the modern region of Western Greece. Its capital is Pyrgos. Until 2011 it ...

, where it had been founded by

Phaedo of Elis Phaedo of Elis (; also, ''Phaedon''; , ''gen''.: Φαίδωνος; fl. 4th century BCE) was a Greek philosopher. A native of Elis, he was captured in war as a boy and sold into slavery. He subsequently came into contact with Socrates at A ...

; it was later transferred to

Eretria Eretria (; , , , , literally 'city of the rowers') is a town in Euboea, Greece, facing the coast of Attica across the narrow South Euboean Gulf. It was an important Greek polis in the 6th and 5th century BC, mentioned by many famous writers ...

by his pupil Menedemus. It can be referred to as the Elian-Eretrian School, on the assumption that the views of the two schools were similar. It died out after the time of Menedemus (3rd century BC), and, consequently, very little is known about its tenets. Phaedo had been a pupil of

Socrates Socrates (; ; – 399 BC) was a Ancient Greek philosophy, Greek philosopher from Classical Athens, Athens who is credited as the founder of Western philosophy and as among the first moral philosophers of the Ethics, ethical tradition ...

, and

Plato Plato ( ; Greek language, Greek: , ; born BC, died 348/347 BC) was an ancient Greek philosopher of the Classical Greece, Classical period who is considered a foundational thinker in Western philosophy and an innovator of the writte ...

named a dialogue, ''

Phaedo ''Phaedo'' (; , ''Phaidōn'') is a dialogue written by Plato, in which Socrates discusses the immortality of the soul and the nature of the afterlife with his friends in the hours leading up to his death. Socrates explores various arguments fo ...

'', in his honor, but it is not possible to infer his doctrines from the dialogue. Menedemus was a pupil of Stilpo at

Megara Megara (; , ) is a historic town and a municipality in West Attica, Greece. It lies in the northern section of the Isthmus of Corinth opposite the island of Salamis Island, Salamis, which belonged to Megara in archaic times, before being taken ...

before becoming a pupil of Phaedo; in later times, the views of his school were often linked with those of the Megarian school. Menedemus' friend and colleague in the Eretrian school was Asclepiades of Phlius. Like the Megarians they seem to have believed in the individuality of "the Good," the denial of the plurality of

virtue A virtue () is a trait of excellence, including traits that may be morality, moral, social, or intellectual. The cultivation and refinement of virtue is held to be the "good of humanity" and thus is Value (ethics), valued as an Telos, end purpos ...

, and of any real difference existing between the Good and the True.

Cicero Marcus Tullius Cicero ( ; ; 3 January 106 BC – 7 December 43 BC) was a Roman statesman, lawyer, scholar, philosopher, orator, writer and Academic skeptic, who tried to uphold optimate principles during the political crises tha ...

tells us that they placed all good in the

mind The mind is that which thinks, feels, perceives, imagines, remembers, and wills. It covers the totality of mental phenomena, including both conscious processes, through which an individual is aware of external and internal circumstances ...

, and in that acuteness of mind by which the

truth Truth or verity is the Property (philosophy), property of being in accord with fact or reality.Merriam-Webster's Online Dictionarytruth, 2005 In everyday language, it is typically ascribed to things that aim to represent reality or otherwise cor ...

is discerned. They denied that truth could be inferred by negative categorical

proposition A proposition is a statement that can be either true or false. It is a central concept in the philosophy of language, semantics, logic, and related fields. Propositions are the object s denoted by declarative sentences; for example, "The sky ...

s, and would only allow positive ones, and of these only simple ones.

Diogenes Laërtius Diogenes Laërtius ( ; , ; ) was a biographer of the Greek philosophers. Little is definitively known about his life, but his surviving book ''Lives and Opinions of Eminent Philosophers'' is a principal source for the history of ancient Greek ph ...

, ii, 135.

Notes

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