Hippias

Hippias of Elis (/ˈhɪpiəs/; Greek: Ἱππίας ὁ Ἠλεῖος; late 5th century BC) was a Greek sophist, and a contemporary of Socrates. With an assurance characteristic of the later sophists, he claimed to be regarded as an authority on all subjects, and lectured on poetry, grammar, history, politics, mathematics, and much else. Most current knowledge of him is derived from Plato, who characterizes him as vain and arrogant.