In Aeschylus’ Choephoroe, while mourning at Agamemnon’s tomb, Orestes swore to avenge his father’s murder and with his sister Electra, worked out a plan for killing Aegisthus and Clytemnestra. Orestes and his friend Pylades, disguised, appear at the door of the palace and ask to see Clytemnestra.... Sign in to see full entry.