«The Poisoned Crown» by Maurice Druon

“This is the original Game of Thrones.” George R.R. Martin.

The puny, self-impotent Louis X, having caused his first wife to be murdered and his mistress exiled, becomes besotted with the lovely Clemence, his new Queen. Vacillating between self-pity and vainglory he is caught between the vaulting ambitions of proud, profligate barons…