Sarah Gristwood is a best-selling biographer, former film journalist, and commentator on royal affairs. She has appeared in most of the UK's leading newspapers and magazines. She wrote two bestselling Tudor biographies, Arbella: England's Lost Queen and Elizabeth and Leicester; and the eighteenth-century story Perdita: Royal Mistress, Writer, Romantic which was selected as Radio 4 Book of the Week.

A regular media commentator on royal and historical affairs, Sarah was one of the team providing Radio 4's live coverage of the royal wedding. She is a Fellow of the RSA, and an Honorary Patron of Historic Royal Palaces. She is the author of The Story of Beatrix Potter and Game of Queens: The Women Who Made the 16th Century.