The Megarian school of philosophy, which flourished in the 4th century BC, was founded by Euclides of Megara, one of the pupils of Socrates. Its ethical teachings were derived from Socrates, recognizing a single good, which was apparently combined with the Eleatic doctrine of Unity. Some of Euclides' successors developed logic to such an extent that they became a separate school, known as the Dialectical school. Their work on modal logic, logical conditionals, and propositional logic played an important role in the development of logic in antiquity.
The Megarian school of philosophy was founded by Euclides of Megara, who had been one of the pupils of Socrates in the late 5th century BC. [1] His successors, as head of the school in Megara, were said to have been Ichthyas (mid 4th century BC), and Stilpo (late 4th century BC). [2] It is unlikely, however, that the Megarian school was a genuine institution, but more of a casual description of its geographic origin, like the Austrian school in economics. Nor did it have a unified philosophical position. [3] It was said that the philosophers of the school were first called Megarians and that later they were called Eristicans, and then Dialecticians, [4] but it is probable that these names designated splinter groups distinct from the Megarian school. [5] Besides Ichthyas, Euclides' most important pupils were Eubulides of Miletus [6] and Clinomachus of Thurii. [7] It seems to have been under Clinomachus that a separate Dialectical school was founded, [8] which placed great emphasis on logic and dialectic, and Clinomachus was said to have been "the first to write about propositions and predicates." [7] However, Euclides himself taught logic, [9] and his pupil, Eubulides, who was famous for employing celebrated paradoxes, [6] was the teacher of several later dialecticians.
Via Stilpo, the Megarian school is said to have influenced the Eretrian school under Menedemus and Asclepiades; Pyrrho, the founder of Pyrrhonism; and Zeno of Citium, the founder of Stoicism. Zeno was said to have studied under Stilpo and Diodorus Cronus, [10] and to have disputed with Philo the Dialectician. It was perhaps the Dialecticians, Diodorus and Philo, who were the biggest influence on the development of Stoic logic, and that Zeno studied under Stilpo to learn his moral teachings, although Stilpo, too, is said to have excelled "in the invention of arguments and in sophistry." [2]
Euclides had been a pupil of Socrates, but ancient historians regarded him as a successor to the Eleatics, hence his philosophy was seen as a fusion of Eleatic and Socratic thought. Thus, the Eleatic idea of "The One" was identified with the Socratic "Form of the Good," [11] and the opposite of Good was regarded by Euclides as non-existent. [4] But the emphasis of his thought is not on being but on the good, and idea that what is opposite to the good does not exist arises from the understanding of the good's unity. [12] This theme is typically Socratic; what matters is the moral good and the will of the good person to strive towards it. Stilpo is said to have continued the Eleatic tendency, by asserting a strict monism and denying all change and motion, [13] and he also rejected Plato's Theory of Forms. [14] In ethics, Stilpo taught freedom, self-control, and self-sufficiency, approaching the teachings of the Cynics, another Socratic school. [15]
Besides studying logical puzzles and paradoxes, the Dialecticians made two important logical innovations, by re-examining modal logic, and by starting an important debate on the nature of conditional statements. [16] This was the work of Diodorus Cronus and Philo the Dialectician, the only two members of the Dialectical school we have detailed information about. Through their development of propositional logic, the Dialectical school played an important role in the development of logic, which was an important precursor of Stoic logic.
Eubulides of Miletus was a philosopher of the Megarian school who is famous for his paradoxes.
Zeno of Citium was a Hellenistic philosopher from Citium, Cyprus. Zeno was the founder of the Stoic school of philosophy, which he taught in Athens from about 300 BC. Based on the moral ideas of the Cynics, Stoicism laid great emphasis on goodness and peace of mind gained from living a life of virtue in accordance with nature. It proved very popular, and flourished as one of the major schools of philosophy from the Hellenistic period through to the Roman era, and enjoyed revivals in the Renaissance as Neostoicism and in the current era as Modern Stoicism.
Chrysippus of Soli was a Greco-Phoenician Stoic philosopher. He was a native of Soli, Cilicia, but moved to Athens as a young man, where he became a pupil of the Stoic philosopher Cleanthes. When Cleanthes died, around 230 BC, Chrysippus became the third head of the Stoic school. A prolific writer, Chrysippus expanded the fundamental doctrines of Cleanthes' mentor Zeno of Citium, the founder and first head of the school, which earned him the title of the Second Founder of Stoicism.
Crates of Thebes was a Greek Cynic philosopher, the principal pupil of Diogenes of Sinope and the husband of Hipparchia of Maroneia who lived in the same manner as him. Crates gave away his money to live a life of poverty on the streets of Athens. Respected by the people of Athens, he is remembered for being the teacher of Zeno of Citium, the founder of Stoicism. Various fragments of Crates' teachings survive, including his description of the ideal Cynic state.
Antisthenes was a Greek philosopher and a pupil of Socrates. Antisthenes first learned rhetoric under Gorgias before becoming an ardent disciple of Socrates. He adopted and developed the ethical side of Socrates's teachings, advocating an ascetic life lived in accordance with virtue. Later writers regarded him as the founder of Cynic philosophy.
Menedemus of Eretria was a Greek philosopher and founder of the Eretrian school. He learned philosophy first in Athens, and then, with his friend Asclepiades, he subsequently studied under Stilpo and Phaedo of Elis. Nothing survives of his philosophical views apart from a few scattered remarks recorded by later writers.
Euclid of Megara was a Greek Socratic philosopher who founded the Megarian school of philosophy. He was a pupil of Socrates in the late 5th century BC, and was present at his death. He held the supreme good to be one, eternal and unchangeable, and denied the existence of anything contrary to the good. Editors and translators in the Middle Ages often confused him with Euclid of Alexandria when discussing the latter's Elements.
Metrocles was a Cynic philosopher from Maroneia. He studied in Aristotle’s Lyceum under Theophrastus, and eventually became a follower of Crates of Thebes, who married Metrocles’ sister Hipparchia. Very little survives of his writings, but he is important as one of the first Cynics to adopt the practice of writing moral anecdotes (chreiai) about Diogenes and other Cynics.
Stilpo was a Greek philosopher of the Megarian school. He was a contemporary of Theophrastus, Diodorus Cronus, and Crates of Thebes. None of his writings survive, but he is described in the writings of others as being interested in logic and dialectic, and he argued that the universal is fundamentally separated from the individual and concrete. His ethical teachings approached that of the Cynics and Stoics. His most important followers were Pyrrho, the founder of Pyrrhonism, and Zeno of Citium, the founder of Stoicism.
Aristo of Chios, also spelled Ariston, was a Greek Stoic philosopher and colleague of Zeno of Citium. He outlined a system of Stoic philosophy that was, in many ways, closer to earlier Cynic philosophy. He rejected the logical and physical sides of philosophy endorsed by Zeno and emphasized ethics. Although agreeing with Zeno that Virtue was the supreme good, he rejected the idea that morally indifferent things such as health and wealth could be ranked according to whether they are naturally preferred. An important philosopher in his day, his views were eventually marginalized by Zeno's successors.
Diodorus Cronus was a Greek philosopher and dialectician connected to the Megarian school. He was most notable for logic innovations, including his master argument formulated in response to Aristotle's discussion of future contingents.
The Eretrian school of philosophy was originally the School of Elis, where it had been founded by Phaedo of Elis; it was later transferred to Eretria 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, and, consequently, very little is known about its tenets. Phaedo had been a pupil of Socrates, and Plato named a dialogue, Phaedo, in his honor, but it is not possible to infer his doctrines from the dialogue. Menedemus was a pupil of Stilpo at Megara 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.
Phaedo of Elis 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 Athens, who warmly received him and had him freed. He was present at the death of Socrates, and Plato named one of his dialogues Phaedo.
This page is a list of topics in ancient philosophy.
Philo the Dialectician was a Greek philosopher of the Megarian (Dialectical) school. He is sometimes called Philo of Megara although the city of his birth is unknown. He is most famous for the debate he had with his teacher Diodorus Cronus concerning the idea of the possible and the criteria of the truth of conditional statements.
Bryson of Achaea was an ancient Greek philosopher.
Ichthyas, the son of Metallus, was a Greek philosopher and a disciple and successor of Euclid of Megara in the Megarian school. He was a colleague of Thrasymachus of Corinth in the school. Ichthyas is described as a man of great eminence, and Diogenes of Sinope is said to have addressed a dialogue to him.
Cynicism is a school of thought of ancient Greek philosophy as practiced by the Cynics. For the Cynics, the purpose of life is to live in virtue, in agreement with nature. As reasoning creatures, people can gain happiness by rigorous training and by living in a way which is natural for themselves, rejecting all conventional desires for wealth, power, and fame, and even flouting conventions openly and derisively in public. Instead, they were to lead a simple life free from all possessions.
Pasicles of Thebes was a Greek philosopher and brother of the Cynic philosopher Crates of Thebes. He attended the lectures of his brother Crates, but he is otherwise connected with the Megarian school of philosophy, because Diogenes Laërtius calls him a pupil of Euclid of Megara, and the Suda calls him a pupil of an unknown "Dioclides the Megarian." Pasicles is said to have been the teacher of Stilpo, who became leader of the Megarian school. Thus we have the implausible situation of Pasicles teaching Stilpo, Stilpo teaching Crates, and Crates teaching Pasicles. Crates named his son Pasicles.
Stoic logic is the system of propositional logic developed by the Stoic philosophers in ancient Greece.