Yeah, that's Chief Qadi, and it's an exception and not really in the same category than the regular Keepers of the Swans and Court Calligraphers. I still doubt that Cupbearers and Food Tasters have more game effects than the relation boosts and possibly tiny boosts in prestige etc. Will have to check this in the game though, if the tooltip says anything about them.
Of course it's for your advantage that your spymaster likes you a lot, so making him Cupbearer or whatsoever is naturally handy because of the boost relations. But I still doubt that the title itself has an effect to thwart assassintion attempts etc. Of course it should, when we think what cupbearers and food tasters actually do (or did in real history) but I doubt the game is that smart. I might be wrong though. Somebody said they can add plot power seriously. Have to check this, too, that it isn't caused by their high intrigue.