Alison Weir (born 8 July 1951) is a British writer of history books, and latterly historical novels, mostly in the form of biographies about British royalty.Her first published work, 1989's Britain's Royal Families, was a genealogical overview of the British royal family. She subsequently wrote biographies of Eleanor of Aquitaine, Isabella of France, Katherine Swynford, and the Princes in the Tower.