Presocratic philosophers

Sources of knowledge

Fragments	Quotations from them in the writings of later commentators
Testimonia	Reports, paraphrases, and summaries by later writers

Doxographers of presocratic thinkers

Plato	ㅤ
Aristotle	ㅤ
Eudemus	Wrote about math and astronomy
Meno	Concentrated on medical writing
Theophrastus	Theories of perception and science
Cicero	1st century BCE
Sextus Empiricus	2nd century BCE
Plutarch	2nd century BCE, Moralia
2nd century anonymous	Placita (opinions)
Bishop Hippolytus of Rome	3rd century, Refutation of All Heresies (refuting Greek philosophy)
Diogenes Laertius	3rd century, The Lives of Philosophers
John Stobaeus	5th century, selections on Natural Philosophy
Simplicius	6th century

presocratics focused on origins of the world, whereas Socrates focused on ethics

Aristotle named them phusikoi (physicists)

First phusikoi came from Ionia.

Thales from Miletus is the first known philosopher

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