While doing the research for my novel, I came across one Armand de Vignerot du Plessis, duc de Richelieu. He was the great-nephew of Cardinal Richelieu (the "villain" of Dumas' Three Musketeers), schoolfriend of Voltaire and one time lover of Emilie. He was a soldier and a diplomat, a politician and a womaniser and his ninety-two years of life (from 1696 to 1788) were filled with one adventure after another, from epic love affairs to political conspiracies to daring military exploits (or so his memoirs would have us believe). Such was the duke's amorous reputation that it is said that Choderlos de Laclos based the character of Valmont in his Les Liaisons Dangereuses on Richelieu (that's John Malkovich or Colin Firth if you're watching one of the film versions of the book).
Originally I had intended for Richelieu to be just a minor figure in the novel, but such a larger-than-life figure refused to be anything other than centre stage and it soon became apparent that he needed to have equal billing with Emilie and Voltaire. My novel now has three central characters and is all the better for it.
Below is a link to a story I wrote a year or so ago based on an event early in Richelieu's political career when he was the French ambassador to Vienna. Believe it or not, most of what takes place in the story really happened...