Antiphon the Sophist (/ˈæntəˌfɒn, -ən/; Greek: ) lived in Athens probably in the last two decades of the 5th century BC. There is an ongoing controversy over whether he is one and the same with Antiphon of the Athenian deme Rhamnus in Attica (480–411 BC), the earliest of the ten Attic orators. For the purposes of this article, they will be treated as distinct persons.
Scholars noted that Iamblichus used many citations from an important early author on education and political philosophy, originally identified in 1889 as Antiphon, but officially referred to as Anonymous Iamblichi.
Antiphon of Rhamnus was a statesman who took up rhetoric as a profession. He was active in political affairs in Athens, and, as a zealous supporter of the oligarchical party, was largely responsible for the establishment of the Four Hundred in 411 (see Theramenes); upon restoration of the democracy shortly afterwards, he was accused of treason and condemned to death. Thucydides famously characterized Antiphon's skills, influence, and reputation: