Unlike the Trevelyan matriarch in Washington, Maxim is an English aristocrat, and the action in The Mister is basically all in London, Cornwall and the Balkans rather than the U.S.
Of Maxim Trevelyan, we know Maxim is a new Earl who falls in love with his housekeeper who has been trafficked into the country from Albania.
Maxim is also a bit of a sex fiend and has other hobbies outside of being the thirteenth earl of his name.