Marcus Aurelius was a Roman emperor and a stoic philosopher. (TV: Deep Breath)

According to Clara Oswald, Aurelius was known as the last of the "five good 'uns". Vastra claimed he was a "[s]uperlative bass guitarist," and mentioned the Doctor knew how to put a band together.

Clara Oswald was a fan of the thinker, and had a poster of his in her bedroom when she was 15. (TV: Deep Breath) She once taught a class at Coal Hill School in which she quoted him as saying, "Waste no more time arguing about what a good man should be. Be one." (TV: The Day of the Doctor)

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