Phren (; plural "phrenes", φρένες) is an Ancient Greek word for the location of thought or contemplation. "Phren" is used, for example, to describe where Achilles considered his sadness about losing Briseis and his duty to join the Greeks against Troy. According to Pythagoras it is one of the intellectual capacities that constitute the soul, along with "nous" (spirit or mind) and "thymos" (passion). The term is also used to refer to a general psychological agent to which moral blame and praise can be extended.