The hero, Thomas More, author of "Utopia," the political philosophy classic. As far as I know he coined the word "utopia," which is some kind of claim to fame. In Latin it means "no place."
He is also a saint of the Catholic Church, and he died because he died for refusing to denounce Catholic doctrine, namely that the Pope is the supreme spiritual leader on earth, and that only with his permission may a marriage be annulled.
He didn't actually want to die. He seemed to have little interest in being a martyr or even a rebel as such. He simply refused to agree to what King Henry VIII was up to as he pulled the Church of England away from the Bishop of Rome.
I admired his lawyerly wit as he danced around the question, trying not to lie, while trying not to commit himself to any particular position in public, so as not to be found guilty of treason. It is impossible not to admire his courage and dedication to what he saw as the truth.
But for me Bolt's Thomas More is a frustrating sort of hero. He is gutsy and brilliant, but he spends most of the play carefully NOT saying what he things, and then, at the end, dying for phantoms he believes in.
The play is a favorite of many Objectivists, or perhaps I should say the movie is. More has some great lines, including "A man's soul is his self." It is a play about a man under tyranny refusing to give his sanction to wrongdoing, and I suspect this is the key to its favor among Oists.