Recently added to medieval-novels.com.
Henry II and Eleanor of Aquitaine
Proud Taste for Scarlet and Miniver, E. L. Konigsburg
The Lion in Winter, James Goldman
Fair Rosamond, Thomas Delaney
Queen In Waiting, Norah Lofts
To Be Queen, Christy English
Murder in the Cathedral, T. S. Eliot
Henry the Second, or The Fall of Rosamund, Thomas Hall
A Murderous Procession, Ariana Franklin
You will also find pretty much all of Jean Plaidy and most if not all of Sharon kay Penman there.