Not only the greatist, but one of the earliest dramatist in ancient greek. This man's name was, Aeschylus. He was famous for his playwrights, and, he was named "the father of tragedy", because all of his playwrights were about tragedy, like "Oresteia". He had made about 90 plays.
One of Aeschylus many plays, was the "Oresteia". Its about a Greek King who comes home from the trojan war, but then troubles strike the family. The "Oresteia" is about revenge and murder, it shows how one evil action, can lead to another. Although the play ends tragically, good triumphs the evil in the end.
The amazing Aeschylus was ended, because of Traumatic brain injury, but tradition says he was ended by an eagle, who mistook Aeschylus bald head for a boulder. He had died at the age of 69, but he still is "the father of tragedy".