Athenian politician, about whom little is known. In the late 460s he became the leading opponent of Cimon. He resisted the sending of help to the Spartans in 462 during the helot revolt, on the ground that Sparta was Athens' rival for power. Supported by Pericles, he took advantage of Cimon's absence, or less probably of the feeling of anger on his dismissal from Sparta, to pass measures taking from the Areopagus its judicial powers of political importance. This aroused such strong feelings that Cimon was ostracized (see ostracism), but later Ephialtes was assassinated.
Subjects: Classical Studies.