Every time that I write a novel I am convinced for at least two years that it is the last one, because a novel is like a child. It takes two years after its birth. You have to take care of it. It starts walking, and then speaking.
History consists of a corpus ascertained facts. The facts are available to the historian in documents, inscriptions and so on, like fish in the fishmonger's slab. The historian collects them, takes them home, and cooks and serves them in whatever style appeals to him.