Anaxag`oras, a Greek philosopher of Clazomenæ, in Ionia, removed to Athens and took philosophy along with him, i. e. transplanted it there, but being banished thence for impiety to the gods, settled in Lampsacus, was the first to assign to the nous, conceived of "as a purely immaterial principle, a formative power in the origin and organisation of things"; d. 425 B.C.