Edward II and Isabella of France
Royal marriages won’t work if both parties are interested in seeing other men.
When Isabella of France married the young, handsome King Edward II in 1308, it seemed like a match made in heaven. Problems started to emerge already at the wedding banquet, however. Edward spent all his time with his “friend” Piers Gaveston, and practically had to be dragged kicking and screaming to his marriage bed.
Things didn’t improve when some nice gentlemen took it upon themselves to cut Gaveston’s head off; Edward simply hooked up with another strapping young lad called Hugh Despenser. To get some privacy, he sent Isabella off on a diplomatic mission to her brother, the king of France.
Here she found herself a lover, gathered an army, and invaded England. After the king had relinquished power to his son, no-one ever heard from him again. Probably because it’s rather difficult to keep in touch with a man who was viciously killed through the process of having his intestines scrambled with a hot, iron poker inserted into his rectum.