My list. In any order:
-Isabella and Ferdinand (three-in-one including Castile for Isabella, Spain for the Sovereigns, Daughters of Spain)
-Catherine de Medici (three-in-one including Madame Serpent, The Italian Woman, Queen Jezebel)
-Lucrezia Borgia (two-in-one including Madonna of the Seven Hills, Light on Lucrezia)
-The Captive of Kensington Palace
-The Queen and Lord M
-The Queen's Husband
-The Widow of Windsor
Some of the Plantagenet and Georgian novels also look great, but I'm not so familiar with them. Also, my list would include everything if I had the chance to add more.
