See also

and

...of Charles Quint, 1519-1558 who, as one web site puts it bravely, was "ruler of Spain, the Netherlands, Austria, Germany and America" Emperor of vast territories, he used to say "I speak Spanish to God, Italian to women, French to men, and German to my horse." For a reason that I ignore, but you should be more curious than me. one mistress made it to posterity and appears in several books and plays: Barbara Blomberg by Georg Ebers

...of French king Louis XIV (reigned 1643-1715) Louise de la Valliere, a good book for adults with the musketeers by Alexandre Dumas and the spicy memoirs of Saint-Simon: Memoirs of Duc de Saint-Simon, 1710-1715: The Bastards Triumphant

...of French king Louis XV (reigned 1715-1774 but from 1715 to 1723 there was a dissolute Regency). Madame de Pompadour by Nancy Mitford and Amanda Foreman or The Portraits of Madame de Pompadour: Celebrating the Femme Savante by Elise Goodman. A semi-legend says that becoming older, the king paid virgin mistresses to satisfy him at a cottage called the Parc-aux-Cerfs, His last mistress Madame du Barry remained in our memories because she was killed during the French Revolution, her last words being "One minute more, please, one little moment."Du Barry was not a traitor to France, just somebody who loved to have a good time. I read her memoirs once, cant recall anything interesting. You might try Madame du Barry: The Wages of Beauty by Joan Haslip

...of American President Thomas Jefferson (1801-1809) Jefferson in Paris (1995) Starring: Nick Nolte, Gwyneth Paltrow, Thandie Newton; Director: James Ivory
To be frank, I have been disappointed in Jefferson. No movie in the world will change my opinion on the rape of a minor slave, "consenting" or not.

...of British duke of Clarence, future William IV (reigned 1830-1837) Mrs. Jordan's Profession: The Actress and the Prince by Claire Tomalin. Mrs Jordan had ten children from the king who left her in misery.

...of Belgian king Leopold II (reigned 1865-1909): Cleo de Merode. I could not find her memoirs in English (it is not very interesting anyways), but I recommend the book of Colette, Gigi, that she probably inspired, a short novel by Colette

...of the Crown Prince Rudolf of Austria and Baroness Mary Vetsera.(they committed suicide or were killed at Mayerling in 1889) The Prince was the only son of Francois-Joseph enperor of Austria and his wife Elisabeth of Bavaria (Sissi) who was assassinated in 1898. Fifty years after the death of Prince Rudolf, and a long time before YouTube and the paparazzi, the mystery of Mayerling was still discussed in every European family: I still remember my grandmother describing the large bosom of Mary Vetsera! Prince Rudolf was married to princess Stephanie of Belgium daughter of king Leopold II . The princess was not refined like the Austrians of the time and was often humiliated and called "the Flemish peasant". Mayerling (1968) Starring: Omar Charif, Catherine Deneuve Director: Terence Young, A new, very interesting version is The Illusionist (2006) Starring: Edward Norton, Paul Giamatti Director: Neil Burger

...of British king Edward VIII (reigned 1936) King Edward abandoned the throne for the love of mrs Simpson, the story says. There was a beautiful slightly ironic creole song :'It was love love love, love alone that made king Edward leave his throne" sung by Harry Belafonte, The series. Edward & Mrs. Simpson (1980) Starring: Edward Fox, Cynthia Harris Director: Waris Hussein is very well played, but it is not a very interesting subject: the couple lacked substance.

...of recent times. Well, even public figures should be entitled to a bit of privacy during their lifetime. I remember that, when the Prince of Wales was in holidays in France, some photographer succeeded in shooting through a bathroom window and got a picture of prince Charles naked. One French journal published the picture on first page with a gold spot hiding his private parts. The reader could scratch the gold, as for a lottery ticket, to have access to a full view. Nobody deserves that.