Which ancient playwright introduced the second actor to theatrical performances?

The introduction of the second actor to theatrical performances is attributed to Aeschylus. This significant development allowed for more complex interactions and dialogue within plays, moving beyond the earlier tradition where only one actor (the protagonist) would perform, accompanied by a chorus. Aeschylus' innovation enabled more dynamic storytelling and character development, as interactions between two actors could create conflict and contrast on stage. This advancement set the stage for future playwrights like Sophocles and Euripides to further expand on character relationships and thematic depth in their works.

The other playwrights mentioned played important roles in the evolution of Greek theatre, but Aeschylus is specifically credited with the introduction of the second actor, which fundamentally changed the nature of theatrical presentations during his time.