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The Euthyphro probably owes its place at the head of the list of dialogues to the fact that it is the first of four dialogues dealing with the trial and death of Socrates. It is probably one of the earliest in date of composition, though that fact is not likely to have affected its position in the series.
Socrates comes to the court of the king archon a magistrate in ancient Athens responsible for religious matters to attend to some preliminaries of his trial on the charge of impiety and corrupting the youth. Here he meets Euthyphro, who is bringing a charge of manslaughter against his father, on account of the death from exposure of a servant who is himself a murderer. Euthyphro says that he is bringing the charge in the interest of piety, and claims to know more than other men about the nature of piety, proper religious observances, and the will of the gods.¹ It is this claim which leads to the discussion of the nature of piety, or holiness, the chief theme of the dialogue.
The purpose of the dialogue is in part to inculcate correct methods of thinking, more especially the dialectic method. Euthyphro, when requested to give a definition of piety or holiness says (5 d) “I say that holiness is doing what I am doing now, prosecuting the wrongdoer who commits murder or steals from the temples or does any such thing, whether he be your father or your mother or anyone else; and not prosecuting him is unholy.”
¹ Of Euthyphro nothing further is known. He may be identical with the Euthyphro who appears in the Cratylus as a philologian someone who studies the history of language addicted to fanciful etymologies.