A Sophist, or professional tutor and philosopher. Thrasymachus is the only real opposition to Socrates. Thrasymachus believes firmly that "justice is to the advantage of the stronger." Sophists as a group tended to emphasize personal benefit as more important than moral issues of right and wrong, and Thrasymachus does as well. Thrasymachus' depiction in Republic is unfavorable in the extreme. He appears conceited, given to boasts and bluster, and his frustration with Socrates and Socrates' method of approaching knowledge through questioning is evident. He leaves at the end of Book I, but his exit suggests he is frustrated and is aware that he has not successfully debated Socrates. Although the choice of name may be inspired by the historical Sophist Thrasymachus, the name literally means "schemer."
The timeline below shows where the character Thrasymachus appears in The Republic. The colored dots and icons indicate which themes are associated with that appearance.
...brother. Socrates and Glaucon are invited to Polemarchus' house by Polemarchus and Adeimantus. They join Thrasymachus and Polemarchus' father, Cephalus. Socrates asks Cephalus if age is as much a hardship as... (full context)
...lifestyle won't make them happy, given the luxuries enjoyed by rulers elsewhere. Socrates says despite Thrasymachus's view, the goal of the city is not to make one group happy at the... (full context)
...wives and children, like the possessions of friends, should be held in common. Glaucon and Thrasymachus support Polemarchus. Socrates concludes that both sexes possess the qualities required to rule. There will... (full context)