Hi Fred,
My thinking is that the Chancellery title has an empire-wide effect, much like the king's acumen does, so it does [EDIT: doesn't (gah!)] matter where he ends up residing.
I didn't check for changes when I did it in my campaign, so I can't say for sure how much percentage boost it gives.
Personally, I'd give it to my best acumen gov, assuming he hasn't got two titles already.
Nothing wrong in giving it to a gov with no title yet.
My only concern about roving/static governors is what would happen if I stuffed up, lost a battle and they got captured. I'd expect the ransom to be correspondingly steep. A bit like losing a prince, say.
I'd feel obliged to pay too, if it was a particularly good gov or worse, several of them.![]()
Suffice to say that, conservative player as I am, I keep them off the front line and, time/training slots permitting, they get retrained with my top quality of armour plus church etc morale boosts.
Bookmarks