Hi there,
Yesterday I've started my first campaign and it ran really well......until I decided to found a dynasty.
Unfortunately my selected bride (after the marriage of course) decided to run into a bunch of evildoers who quickly finished her off.
Yeah, it was my fault, don't let your beloved wander around in uncivilized areas searching for whatever without anyone to protect her. 
Now after an appropriate time of mourning I decided do try it again....BUT it wasn't possible. In the dynasty screen the late maiden still occupied the slot and without any offsprings this dynasty (well sort of) is doomed.
Is this intentional? Hell yeah, its romantic and maybe suitable for a game of fantasy....but at least political not useful. 
Greetings from good old europe
AndBett