Charlotte Higgins: “When speaking to historians, novelists and curators of the period, I found that they would, at some point in the conversation, reach for a pop-cultural analogy. The Tudors are like the Kardashians, said one. They are like the Caesars, or the Kennedys, said another. They are like Game of Thrones, said one. They are like House of Cards, said another. They are like Dallas, they are like Dynasty, said another.”