Persons of the dialogue: + 

Socrates, who is the narrator to his Companion + 

Hippocrates + 

Alcibiades + 

Critias + 

Protagoras, a Sophist + 

Hippias, a Sophist + 

Prodicus, a Sophist + 

Callias, a wealthy Athenian + 

Scene: The House of Callias + 