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Theodoret’s contribution to the reconstruction of Aët. Plac. ch. 1.3 ‘On the principles’ has been overestimated by Hermann Diels and denied by others. Comparison of the lists of principles in ps.Plutarch, Stobaeus and Theodoret (who has two such lists), the three authors considered as sources for Aëtius, as well as in the Stromateis of another ps.Plutarch, shows both these views to be partly mistaken. Theodoret CAG 4.5 on Xenophanes (perhaps, and in part), 4.9 on Democritus, 4.9 on Metrodorus, 4.11 on Plato, 4.11 on Aristotle, 4.11 on Ecphantus, 4.12 on Zeno of Citium, and 4.12 on Xenocrates (perhaps) should be associated with Aët. 1.3. But the greater part of CAG 4.5–6 on Xenophanes, as well as 4.7 on Parmenides, 4.7 on Melissus, 4.9 on Epicurus, 4.12 on Hippasus and Heraclitus, and 4.12 on Diogenes of Apollonia, all included by Diels in Aët. 1.3, are probably derived from a different source shared with the Stromateis.