In Greek mythology, Pyrrhus is the grandson of what immortal nereid?
Pyrrhus (Royer) Pyrrhus is an opera by the French composer Joseph-Nicolas-Pancrace Royer, first performed at the Académie Royale de Musique (the Paris Opera) on 26 October 1730. It takes the form of a "tragédie en musique" in a prologue and five acts. The libretto, by Fermelhuis, is based on the Greek myth of Pyrrhus, son of Achilles.
Atreus In Greek mythology, Atreus ( , ;, from ἀ-, "no" and τρέω, "tremble", "fearless", Greek: Ἀτρεύς ) was a king of Mycenae in the Peloponnese, the son of Pelops and Hippodamia, and the father of Agamemnon and Menelaus. Collectively, his descendants are known as Atreidai or Atreidae.