Erasmus was a philologist, grammarian, theologian, and rhetorician. The only pupil of Empedocles who is mentioned is the sophist and rhetorician Gorgias. Euphrades, (eloquent), was a statesman, rhetorician, and philosopher. The eulogy was delivered by the famous humanist rhetorician and prelate Johann Roth. The rhetorician and philosopher Walter Ong also believes that Plato was phonocentric. Flavius Merobaudes was a 5th-century Latin rhetorician and poet. Anaximenes of Lampsacus (; ; 320 BC) was a Greek rhetorician and historian. Anaximenes of Lampsacus, a rhetorician and historian. Rhetorical criticism is an art that involves the rhetorician developing strong reasoning for their judgement. Gorgias identifies his craft as rhetoric, and affirms that he should be called a rhetorician. Theodotus of Chios was a trained rhetorician and the tutor of Ptolemy XIII. Optatus probably began as a pagan rhetorician. Dante's portrayal of della Vigna emphasises his skill as a rhetorician. Thrasymachus as a successful rhetorician in his "Phaedrus", but attributes nothing significant to him. During his political career, Calhoun gained a reputation as a great rhetorician and intellectual.