The Taming of the Queen is the best work of Philippa Gregory's that I've read for a very long time. It is a gripping depiction of the marriage of Katherine Parr to Henry the Eighth – she was his last wife and the only one to survive him.
The author's note makes it clear that it is mostly based closely on the history with the exception of one important incident between Katherine and Henry (which relates to the book title) which is fictional. And in fact that was the only part of the book that didn't ring quite true for me.
The famous painting of the King, Queen and his 3 children is dealt with magnificently. I had forgotten that the Queen sat for the portrait unaware until it was unveiled that the face of Jane Seymour was painted instead of her own!