Hermotimus of Clazomenae (c. 6th century BCE), called by Lucian a Pythagorean, was a philosopher who first proposed, before Anaxagoras (according to Aristotle) the idea of mind being fundamental in the cause of change.
Raven contributed the chapters relating to the Italian tradition (Pythagoras of Samos, Alcmaeon of Croton, Pre-Parmenidean Pythagoreanism, Parmenides of Elea, Zeno of Elea, Melissus of Samos, Philolaus of Croton and Eurytus of Croton) and on Anaxagoras and Archelaus.
Other important philosophers and thinkers in the Sicilian Questions referred to are, in alphabetical order, Alexander of Aphrodisias, Anaxagoras, Berosus, Crates, Diogenes, Euclid, Al-Farabi, Galen, Al-Ghazali, Al-Hallaj, Ibn Bajja (Avempace) Ibn Sina (Avicenna), Iamblichus, Mellow, Parmenides, Pythagoras, Plato, Socrates, Themistius, Theophrastus, and Zeno of Elea.
His father Anaxagoras, known as Alex, was a grandson of a Russian priest; Alex taught Peter to ski; he disappeared in the mountains while skiing, presumed dead, when Peter was fifteen.