The Skill and The Wit (spoilers all RotE books)

[Thick]

Yes, just found this from Chade, speaking to Fitz, in Chapter Eleven of FE, 'Chade's Tower':

...But others point back a time, to the Piebald Prince and several other oddlings in the Farseer line, to say, "No, the taint is there, down in the roots, and Prince Dutiful is a shoot from that line."

It's after this that they mention that "the Piebald Prince died without issue" (confirming what I said earlier) but of the 'other oddlings' there is no mention. This suggests that there were other Witted ones who popped up earlier in the Farseer line.

Not sure if this is the quote you were after, SwiftWitted? I know that Fitz talked about the Witted in other areas such as the little chapter intros...

There is Wit in the Farseer line, the book The Piebald Prince and (something) Princess explains the story of the Piebald Prince and his mother. And it also explains the origin of the hate of witted people.

I don't think that King Wisdom was an Elderling, I think he'd be too far down the line from Taker, who I think has a chance if being an Elderling.

I hadn't occured to me that King Wisdom had met real Elderlings... But it would explain how the old coteries knew about carving memory stone - which we know the Elderlings did. I think Malta sees this in a remembered scene when she's trying to rescue Tintaglia...

I wonder why Out islanders don't have a knack for the skill...

I think Wintrow was tapping into the skill when he does his healing, his art etc.