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  • Thales of Miletus

    625 BC – 548 BC

  • Anaximander of Miletus

    612 BC – 551 BC

  • Xenophanes

    571 BC – 466 BC

  • Anaximenes

    571 BC – 529 BC

  • Heraclitus of Ephesus

    571 BC – 531 BC

  • Parmenides

    516 BC – 451 BC

  • Zeno of Elea

    491 BC – 431 BC

  • Democritus

    431 BC – 401 BC