The Finale, of the life of Cato the Younger. In this episode:
A tale of principle and paradox, Cato's resolute stand for Republican values helped precipitate its own downfall. His death at Utica - dramatic, philosophical, and on his own terms - marked not just the end of his life but symbolically, the end of the Roman Republic itself.
Check out Becoming the Main Character. Here's a link to the Moby Dick episode.