Callicles

Athenian political figure and Socrates's most formidable opponent in Plato's Gorgias — arguing that the strong should rule the weak, that conventional justice is a slave morality invented by the weak to constrain the naturally superior — anticipating Nietzsche's master morality by 2,400 years.

Articulates the most coherent case for natural right against conventional justice — nature itself reveals that the strong should have more than the weak, that philosophy is fine for the young but becomes contemptible in a man who refuses to enter the arena of political life — making the Callicles challenge the deepest critique Socrates faces.