I tried
Pagan Magician
Mercenary Captain
Biographer
(Brilliant?) Fool

And unless I was doing something wrong, none of them would budge. "Are you sure"
"Cannot do that" or something along those lines they said.

I'll try again when the Black Death calms down a bit. My princes are quarantined seperately at the moment.

I havent tried objects and the like yet.
-the Assassin's Knife and such.
And the special one I had died on me before I could anticipate it.
Maybe they'll move.