Finally... just started to read Sharon Penmans' "The Devils Brood". Focussed mainly on the period of the Plantagenet children - William, Geoffrey, Richard (Lionheart), John etc etc
It's the third (and final) book in the series. I had read the first two a while back and decided to re-read them before starting Brood, as there is a lot of important background stuff that is strongly relevant to the climax in Book 3. That, and it's taken a while to get thru the first two!!! ("When Christ & His Saints Slept", focussed on Henry I and his daughter Matilda and the claim for the English throne by Stephen, and "Time & Chance", largely about Henry II's ascension to the throne and his marriage to Eleanor, Queen Of France and wife of his bitterest rival King Louis Capet).
Historical fiction at it's best. I know quite a bit about Medieval English history, and I love the way she ties in fictional characters to REAL characters and events. She also has a good appendix explaining her reasoning behind those characters' creation, and clearing up some factual issues...