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- Thales of Miletus (c. 624–546 BCE)
- Anaximander (c. 610–546 BCE)
- Anaximenes (c. 585–528 BCE)
- Pythagoras (c. 570–495 BCE)
- Heraclitus (c. 535–475 BCE)
- Parmenides (c. 515–450 BCE)
- Zeno of Elea (c. 490–430 BCE)
- Empedocles (c. 494–434 BCE)
- Anaxagoras (c. 500–428 BCE)
- Leucippus (5th century BCE)
- Democritus (c. 460–370 BCE)
- Xenophanes (c. 570–475 BCE)
- Melissus of Samos (fl. 5th century BCE)
- Protagoras (c. 490–420 BCE)
- Gorgias (c. 483–375 BCE)
- Parmenides (c. 515–450 BCE)
- Philolaus (c. 470–385 BCE)
- Diogenes of Apollonia (c. 460–400 BCE)