Plato’s early dialogues take on the trial and execution of his mentor Socrates. Plato wrote five dialogues, each questioning a so-called virtue of Athenian society (such as modesty). Plato shows how hard they are to define, thereby exposing the charges against Socrates as a sham. In this study guide on the Euthyphro for LitCharts, Plato targets the concept of piety.