We hypothesized that it had originally belonged to Charles Lennox, the third Duke of Richmond, a man of deeply radical views who was politically active in Britain before, during, and after the American Revolution. Goodwood, the Duke’s family seat, is in Sussex. At some point prior to the 1950s, when it was deposited in the record office, the Sussex Declaration had come into the possession of the law firm that worked for the Duke of Richmond. It was unclear when or how the document might have found its way into the hands of the Duke himself. But that tip from the taxi driver suggested a possible answer: Had Charles Lennox and Thomas Paine known each other?