Board Thread:Lore Discussion/@comment-24177102-20131118171125/@comment-13446185-20131121032159

Well supposedly Karstaag was a great adviser of High King Ysgramor.

"High King Ysgramor took the loss of the Dumb Old Giant, one of his greatest counselors outside of Torc and Talking-Belt, with great anger"

-KINMUNE

But then again they do refer to Karstaag as the "Dumb Old Giant". What I find interesting is that according to this, Karstaag must been at least 4000 years old when he died in TES III: Bloodmoon.