| Anaxagoras | |
| Antisthenes | 444 BC - 371 BC |
| Aristotle | 384 BC - 322 BC |
| Democritus | 460 BC - 370 BC |
| Diogenes | 412 BC - 323 BC |
| Empedocles | 490 BC - 430 BC |
| Epictetus | 55 - 135 |
| Epicurus | 341 BC - 271 BC |
| Heraclitus | 544 BC - 483 BC |
| Diogenes of Sinope | 412 BC - 323 BC |
| Plutarch | 46 - 120 |
| Protagoras | 481 BC - 411 BC |
| Thales | 624 BC - 546 BC |
| Theophrastus | |
| Xenocrates | 396 BC - 314 BC |
| Xenophanes | 570 BC - 480 BC |
| Citium Zeno | 335 BC - 264 BC |