Aristocratic men and women were brought up with the idea that it was their responsibility to forge alliances that would enhance their families' prestige. Of course, one's proximity to the monarch was of prime importance not only for this reason, but for one's security. To have the protection of the king meant everything in an age when jealous nobles made
false accusations and claims in order to acquire another's property. We will never know how sincere Diane's love for Henri II was. But, she was certainly grateful for the relationship and her behavior, for the most part, was exemplary.
Of course, one must deplore her part in the Jarnac affair and her religious bigotry. Still, she stands along with Madame
de Pompadour as being one of the better royal mistresses of history.