Anaximenes of Miletus (b.

585 BCE, d. 528 BCE) is an Archaic Greek Pre-Socratic philosopher active in the latter half of the 6th century BC.

One of the three Milesian philosophers, he is identified as a younger friend or student of Anaximander.

Anaximenes, like others in his school of thought, practiced material monism.

This tendency to identify one specific underlying reality made up of a material thing constitutes the bulk of the contributions for which Anaximenes is most famed.