Who are Phaedo and Echecrates?

Phaedo, present during the last moments of Socrates' life, is the pupil of Socrates who narrates the fourth dialogue in this collection. He doesn't participate to any significant degree in that dialogue, but instead describes its content to Echecrates, who is portrayed by Plato as being eager to learn what Socrates said in his last moments and how he met his death.