Sounds like a rather trite set-up.
Wife to be is a noble from a place that trucks with evil and is, therefore, presumably evil herself. Arranged marriage. Wife to be comes complete with a black-armoured 'protector.'
Methinks player's character will be found floating face down in the moat, about 3 days after he attains rulership.
You know what has me curious now, is how did the grandfather approve of the to-be bride? What's he have to gain from this?
Or is he charmed/dominated/coerced?
... No. Unpleasant =/= Evil.Really. There is active "Evil" and passive "evil". Active "Evil" makes you makes you truly despicable, passive "evil" just makes you unpleasant.
Inquisitors would be even better, what with the massive bonuses to Sense Motive and an array of truth-revealing spells.Can you arrange a mixer party with a few paladins?