Aeschylus was a fifth century Athenian playwright who is considered the father of tragic drama. He introduced to his plays a second actor in order to allow dialogue between the actors. His plays include "The Persians," "The Suppliants," "Prometheus Bound" and the "Orestian Trilogy" which is generally considered his masterpiece. Aeschylus attempts to show "an invincible spirit precisely when disaster is irreparable." His characters meet calamity, pain and suffering with courage and nobility. He viewed and presented pain and suffering, as well as evil, as the path to knowledge.