Diogenes Laërtius in the context of "Italian school (philosophy)"

Parmenides of Elea (/pɑːrˈmɛnɪdiːz ... ˈɛliə/; Ancient Greek: Παρμενίδης ὁ Ἐλεάτης; fl. late sixth or early fifth century BC) was a pre-Socratic Greek philosopher from Elea in Magna Graecia (Southern Italy).

Parmenides was born in the Greek colony of Elea to a wealthy and illustrious family. The exact date of his birth is not known with certainty; on the one hand, according to the doxographer Diogenes Laërtius, Parmenides flourished in the period immediately preceding 500 BC, which would place his year of birth around 540 BC; on the other hand, in the dialogue Parmenides Plato portrays him as visiting Athens at the age of 65, when Socrates was a young man, c. 450 BC, which, if true, suggests a potential year of birth of c. 515 BC. Parmenides is thought to have been in his prime (or "floruit") around 475 BC.

Xenophon of Athens (/ˈzɛnəfən, -ˌfɒn/; Ancient Greek: Ξενοφῶν; c. 430 – 355/354 BC) was a Greek military leader, philosopher, and historian. At the age of 30, he was elected as one of the leaders of the retreating Greek mercenaries, the Ten Thousand, who had been part of Cyrus the Younger's attempt to seize control of the Achaemenid Empire. As the military historian Theodore Ayrault Dodge wrote, "the centuries since have devised nothing to surpass the genius of this warrior".

For at least two millennia, it has been debated whether Xenophon was first and foremost a general, historian, or philosopher. For the majority of time in the past two millennia, Xenophon was recognized as a philosopher. Quintilian in The Orator's Education discusses the most prominent historians, orators and philosophers as examples of eloquence and recognizes Xenophon's historical work, but ultimately places Xenophon next to Plato as a philosopher. Today, Xenophon is recognized as one of the greatest writers of antiquity. Xenophon's works span multiple genres and are written in plain Attic Greek, which is why they have often been used in translation exercises for contemporary students of the Ancient Greek language. In the Lives and Opinions of Eminent Philosophers, Diogenes Laërtius observed that Xenophon was known as the "Attic Muse" because of the sweetness of his diction.

The Ionian school of pre-Socratic philosophy refers to Ancient Greek philosophers, or a school of thought, in Ionia in the 6th century BC, the first in the Western tradition.

The Ionian school included such thinkers as Thales, Anaximander, Anaximenes, Heraclitus, Anaxagoras, and Archelaus. This classification can be traced to the doxographer Sotion. The doxographer Diogenes Laërtius divides pre-Socratic philosophy into the Ionian and Italian school. The collective affinity of the Ionians was first acknowledged by Aristotle who called them physiologoi (φυσιολόγοι), or natural philosophers. They are sometimes referred to as cosmologists, since they studied stars and maths, gave cosmogonies and were largely physicalists who tried to explain the nature of matter.

Satyrus (Ancient Greek: Σάτυρος) of Callatis was a distinguished Peripatetic philosopher and historian, whose biographies of famous people are frequently referred to by Diogenes Laërtius and Athenaeus. He came from Callatis Pontica, as was learned from a Herculaneum papyrus. He lived earlier than the reign of Ptolemy VI Philometor (181–146 BC) when his Lives were epitomized by Heraclides Lembus, probably during the 3rd century BC. Athenaeus frequently refers to him as a Peripatetic, but his connection to the Peripatetic school is otherwise unknown. His biographies dealt with many eminent people including kings (Dionysius the Younger, Philip), statesmen (Alcibiades), orators (Demosthenes), poets (Aeschylus, Sophocles, Euripides), and philosophers (Bias of Priene, Chilon of Sparta, Pythagoras, Empedocles, Zeno of Elea, Anaxagoras, Socrates, Diogenes, Anaxarchus, Stilpo). He also wrote on the population of Alexandria, and a work On Characters (Περὶ χαρακτήρων). Fragments of his biography of the Athenian dramatist Euripides were found at the end of a papyrus scroll discovered at Oxyrhynchus in the early twentieth century.

Cleinias of Tarentum (Ancient Greek: Κλεινίας; fl. 4th-century BCE), Magna Graecia, was a Pythagorean philosopher, and a contemporary and friend of Plato, as appears from the story (perhaps otherwise worthless) which Diogenes Laërtius gives on the authority of Aristoxenus, to the effect that Plato wished to burn all the writings of Democritus which he could collect, but was prevented by Cleinias and Amyclus of Heraclea. In his practice, Cleinias was a true Pythagorean. Thus, we hear that he used to assuage his anger by playing on his harp; and, when Prorus of Cyrene had lost all his fortune through a political revolution, Cleinias, who knew nothing of him except that he was a Pythagorean, took on himself the risk of a voyage to Cyrene, and supplied him with money to the full extent of his loss.

Two fragments of Pythagorean pseudepigrapha are attributed to Cleinias, one preserved by Stobaeus, the other in the Theology of Arithmetic attributed to Iamblichus.

Lysis of Taras (/ˈlaɪsɪs/; Greek: Λῦσις; fl. c. 5th-century BC) was a Greek philosopher. His life is obscure. He was said to have been a friend and disciple of Pythagoras. After the persecution of the Pythagoreans at Croton and Metapontum in Magna Graecia he escaped and went to Thebes, where he became the teacher of Epaminondas, by whom he was held in the highest esteem. There are, however, serious chronological difficulties with his being both a disciple of Pythagoras and the teacher of Epaminondas. Some of the commentators and doxographers have failed to distinguish between the two different anti-pythagorean revolutions: the first one around ~500, when Pythagoras himself died, and the second one fifty years later. This could clarify the source of the chronological incoherence.

Lysis was credited as the actual author of a work which was attributed to Pythagoras himself. Diogenes Laërtius quotes from an undoubtedly spurious letter from Lysis to Hippasus as an authority for some statements concerning Damo.

Sotion of Alexandria (Ancient Greek: Σωτίων, gen.: Σωτίωνος; fl. c. 200 – 170 BC) was a Greek doxographer and biographer, and an important source for Diogenes Laërtius. None of his works survive; they are known only indirectly. His principal work, the Διαδοχή or Διαδοχαί (the Successions), was one of the first history books to have organized philosophers into schools of successive influence: e.g., the so-called Ionian School of Thales, Anaximander and Anaximenes. It is quoted very frequently by Diogenes Laërtius, and Athenaeus. Sotion's Successions likely consisted of 23 books, and at least partly drew on the doxography of Theophrastus. The Successions was influential enough to be abridged by Heraclides Lembus in the mid-2nd century BC, and works by the same title were subsequently written by Sosicrates of Rhodes and Antisthenes of Rhodes.

He was also, apparently, the author of a work, On Timon's Silloi, and of a work entitled Refutations of Diocles.