Breakin' the Law
Crimes against the king
Treason is the most obvious, but there were others. Treason was more than just plotting to overthrow the king. The French term was lese-majèste, which means something along the lines of defamation or dishonoring the majesty of the king. This covered things like conspiring with the enemies of the king.
Perhaps less obvious are crimes in areas normally under royal authority. This included clipping coins, because minting was under royal authority (not always, but where it had been also granted to a magnate then the crime was against that magnate). Poaching on royal lands was another. Assault of royal officials yet another. It wasn't so much that the crimes themselves were heinous as it was that they undermined royal authority, and that in turn threatened the stability of society itself.