Despite playing this game for years, I'm still finding the odd thing I never knew.

I don't use mercenaries much and when I do I don't keep them around once they've achieved their immediate objective. So it was a surprise when I found I could have the leader of a mercenary unit marry into my royal family.

So what would happen if all the heirs died and this guy was the only one left when the king died? Could he become king or would it just be game over? I suspect the latter.

It would be nice if merc units could reinforce themselves over time, like the king can. It would be historically accurate. Is that moddable, or hard-coded? Being able to name specific units, like in Panzer General, is the one thing missing from the game that would have really have enhanced it, IMO.