Anaxagoras

Anaxagoras of Clazomenae (Ἀναξαγόρας ὁ Κλαζομεναῖος, Anaxagoras ho Klazomenaîos; /ˌænæksˈæɡərəs/), was a preeminent figure in the history of Greek philosophy; a philosopher of the Ionian school, he is often associated with the city of Athens, where he was an influential thinker during the city's Golden Age. Clazomenae is near present-day Urla, Turkey, then controlled by Persia; and Anaxagoras brought the Ionian tradition of natural philosophy to Athens.

He is credited with introducing the concept of nous (mind or intellect) as a cosmic principle that imposed order on the primeval chaos. His philosophical inquiries delved into the nature of existence, the cosmos, and the underlying principles that govern the physical world. According to Anaxagoras, all things were composed of infinite, minuscule particles, which he called seeds or homeomerous, and it was the nous that initiated the cosmic rotation, leading to the creation of the world. He believed that this mind or intellect was the force behind the design and order of the universe, and his work marks an important departure from the previous mythological explanations of cosmic origins and operations, moving towards a more rational and scientific understanding.

His thoughts on nous suggested that this intellect was not only the initial cause of the cosmic order but also permeated all things, giving them life and purpose. This was a revolutionary idea that contributed significantly to the development of metaphysics and epistemology. Anaxagoras’ work in natural philosophy extended to explanations of various natural phenomena, including solar and lunar eclipses, the phases of the moon, and the rainbow. His naturalistic approach to explaining these events was based on observation and rational interpretation, and he is often credited with laying the groundwork for a scientific method of inquiry.

Despite his intellectual contributions, Anaxagoras' advanced ideas eventually led to conflict with contemporary religious and social norms. Around 450 BCE, he introduced the notion that the sun was not a god but rather a fiery mass, and that the moon reflected the sun's light. Such teachings challenged traditional Greek religious beliefs, particularly the notion of Helios the sun god, and thereby clashed with the reverence of celestial bodies as divine entities.

Anaxagoras' challenges to traditional Greek religious beliefs eventually led to his indictment by political opponents aligned against Pericles, particularly by the conservative faction that resented Pericles' circle of intellectuals. The specific charge against Anaxagoras was impiety (asebeia), which was a serious offense in Athens, reflecting the societal expectation that citizens would uphold and respect the state-sanctioned pantheon of gods.

The legal event of his trial is not as well-documented as those of later philosophers like Socrates, but it is known that Anaxagoras was eventually forced into exile. Some sources suggest that Pericles managed to have the death sentence commuted, and Anaxagoras retired to Lampsacus in the Troad (now in northwestern Turkey), where he continued his philosophical work until his death around 428 BCE.