Billy's Books 17 explores George R. R. Martin's latest Westerosi history, Fire & Blood.
Fire & Blood is a history of the Targaryen dynasty by a maester three centuries after the events have transpired. He mostly draws from three sources, often noting discrepancies. The author describes the many sides of a story and usually picks the most plausible, but often leaves it up to the reader to decide. There are a lot of dragons.