I was listening to Dan Carlin's podcast about the start of Merovingian dynasty, and he made a snide quip about the early Merovingians (starting with Clovis) and even Carolingians not exactly being paragons of Christian morality - including having official concubines.
We also know that many later French kings in 16th+ century clearly had mistresses (I'm excluding Louis XIII who everyone and their grandmother thinks was homosexual or at least bi, and had male lovers even if he had no known female mistresses).
Were there any French kings who probably had no extramarital sexual relations? (e.g. who were renowned among their contemporaries for their "chastity," as opposed to merely not having proof to the contrary).
I'm doing this according to Catholic doctrine, so divorcing and re-marrying counts as "extramarital" - so Philip I the Amorous doesn't count even if he married Bertrade de Montfort.
Also, someone who was actually married and of an age/position to have extramarital affairs is a working assumption here.