Nearly all the characters in Greek tragedy were the heroes of well-known popular legends. In abandoning the well-trodden circle Aeschylus has here ensured an undying freshness for his work--it is novel, free and unconventional; more than that, it is dignified. The slightest error of taste would have degraded if to the level of a comedy; throughout it maintains a uniform tone of loftiness and sincerity. The language is easy but powerful, the art with which the story is told is consummate. Finally, it is one of the few pieces in the literature of the world which are truly sublime; it ranks with Job and Dante. The great purpose of creation, the struggles of beings of terrific power, the majesty of gods, the whole universe sighing and lamenting for the agonies of a deity of wondrous foresight, saving others but not himself--such is the theme of this mighty and affecting play. In 458 Aeschylus wrote the one trilogy which is extant. It describes the murder of Agamemnon, the revenge of Orestes and his purification from blood-guiltiness. It will be necessary to trace the history of Agamemnon's family before we can understand these plays. His great-grandfather was Tantalus, who betrayed the secrets of the gods and was subjected to unending torture in Hades. Pelops, his son, begat two sons, Atreus and Thyestes. The former killed Thyestes' son, invited the father to a banquet and served up his own son's body for him to eat. The sons of Atreus were Agamemnon and Menelaus, who married respectively Clytemnestra and Helen, daughters of Zeus and Leda, both evil women; the son of Thyestes was Aegisthus, a deadly foe of his cousins who had banished him. The "inherited curse" then had developed itself in this unhappy stock and it did not fail to ruin it. When Helen abandoned Menelaus and went to Troy with Paris, Agamemnon led a great armament to recover the adulteress. The fleet was wind-bound at Aulis, because the Greeks had offended Artemis. Chalcas the seer informed Agamemnon that it would be impossible for him to reach Troy unless he offered his eldest daughter Iphigeneia to Artemis. Torn by patriotism and fatherly affection, Agamemnon resorted to a strategem to bring his daughter to the sacrifice. He sent a messenger to Clytemnestra saying he wished to marry their child to Achilles. When the mother and daughter arrived at Aulis they learned the bitter truth. Iphigeneia was indeed sacrificed, but Artemis spirited her away to the country now called Crimea, there to serve as her priestess. Believing that her daughter was dead, Clytemnestra returned to Argos to plot destruction for her husband, forming an illicit union with his foe Aegisthus, nursing her revenge during the ten years of the siege.